Configuration THEMENAME.settings depends on the THEMENAME theme that will not be installed after import.

#16 worked for me; using Bootstrap sub-theme

I had themes left over in my configuration, from D7 migration project. I felt the drush commands did a more through job of getting DB and config matching. #11 worked good for me clearing out these old theme and block configurations. I can now import SINGLE config changes (like a view) from my development site easy. THANKS ALL.

 [notice] Synchronized configuration: delete riley.settings.
 [notice] Synchronized configuration: delete block.block.adminimal_user_online.
 [notice] Synchronized configuration: delete block.block.adminimal_user_new.
 [notice] Synchronized configuration: delete block.block.adminimal_comment_recent.
 [notice] Synchronized configuration: delete block.block.adminimal_block_20.
 [notice] Synchronized configuration: delete block.block.adminimal_block_42.
 [notice] Synchronized configuration: delete block.block.adminimal_block_55.
 [notice] Synchronized configuration: delete block.block.adminimal_block_58.
 [notice] Synchronized configuration: delete block.block.adminimal_menu_menu_site_tools.
 [notice] Synchronized configuration: delete block.block.bartik_user_login.
 [notice] Synchronized configuration: delete block.block.garland_block_20.
 [notice] Synchronized configuration: delete block.block.garland_block_42.
 [notice] Synchronized configuration: delete block.block.garland_block_55.
 [notice] Synchronized configuration: delete block.block.garland_block_58.
 [notice] Synchronized configuration: delete block.block.garland_menu_menu_site_tools.
 [notice] Synchronized configuration: delete block.block.riley_block_20.
 [notice] Synchronized configuration: delete block.block.riley_block_42.
 [notice] Synchronized configuration: delete block.block.riley_block_55.
 [notice] Synchronized configuration: delete block.block.riley_menu_menu_site_tools.
 [notice] Synchronized configuration: delete block.block.adminimal_block_1.
 [notice] Synchronized configuration: delete block.block.adminimal_block_2.
 [notice] Synchronized configuration: delete block.block.adminimal_block_22.
 [notice] Synchronized configuration: delete block.block.adminimal_block_23.
 [notice] Synchronized configuration: delete block.block.adminimal_block_28.
 [notice] Synchronized configuration: delete block.block.adminimal_block_29.
 [notice] Synchronized configuration: delete block.block.adminimal_block_30.
 [notice] Synchronized configuration: delete block.block.adminimal_block_31.
 [notice] Synchronized configuration: delete block.block.adminimal_block_32.
 [notice] Synchronized configuration: delete block.block.adminimal_block_33.
 [notice] Synchronized configuration: delete block.block.adminimal_block_34.
 [notice] Synchronized configuration: delete block.block.adminimal_block_35.
 [notice] Synchronized configuration: delete block.block.adminimal_block_36.
 [notice] Synchronized configuration: delete block.block.adminimal_block_37.
 [notice] Synchronized configuration: delete block.block.adminimal_block_38.
 [notice] Synchronized configuration: delete block.block.adminimal_block_46.
 [notice] Synchronized configuration: delete block.block.adminimal_block_49.
 [notice] Synchronized configuration: delete block.block.adminimal_block_51.
 [notice] Synchronized configuration: delete block.block.adminimal_block_6.
 [notice] Synchronized configuration: delete block.block.adminimal_block_61.
 [notice] Synchronized configuration: delete block.block.adminimal_system_main.
 [notice] Synchronized configuration: delete block.block.bartik_search_form.
 [notice] Synchronized configuration: delete block.block.bartik_system_main.
 [notice] Synchronized configuration: delete block.block.bartik_system_powered_by.
 [notice] Synchronized configuration: delete block.block.garland_block_1.
 [notice] Synchronized configuration: delete block.block.garland_block_2.
 [notice] Synchronized configuration: delete block.block.garland_block_22.
 [notice] Synchronized configuration: delete block.block.garland_block_23.
 [notice] Synchronized configuration: delete block.block.garland_block_28.
 [notice] Synchronized configuration: delete block.block.garland_block_29.
 [notice] Synchronized configuration: delete block.block.garland_block_30.
 [notice] Synchronized configuration: delete block.block.garland_block_31.
 [notice] Synchronized configuration: delete block.block.garland_block_32.
 [notice] Synchronized configuration: delete block.block.garland_block_33.
 [notice] Synchronized configuration: delete block.block.garland_block_34.
 [notice] Synchronized configuration: delete block.block.garland_block_35.
 [notice] Synchronized configuration: delete block.block.garland_block_36.
 [notice] Synchronized configuration: delete block.block.garland_block_37.
 [notice] Synchronized configuration: delete block.block.garland_block_38.
 [notice] Synchronized configuration: delete block.block.garland_block_46.
 [notice] Synchronized configuration: delete block.block.garland_block_49.
 [notice] Synchronized configuration: delete block.block.garland_block_51.
 [notice] Synchronized configuration: delete block.block.garland_block_6.
 [notice] Synchronized configuration: delete block.block.garland_block_61.
 [notice] Synchronized configuration: delete block.block.garland_system_main.
 [notice] Synchronized configuration: delete block.block.riley_block_1.
 [notice] Synchronized configuration: delete block.block.riley_block_2.
 [notice] Synchronized configuration: delete block.block.riley_block_22.
 [notice] Synchronized configuration: delete block.block.riley_block_23.
 [notice] Synchronized configuration: delete block.block.riley_block_28.
 [notice] Synchronized configuration: delete block.block.riley_block_29.
 [notice] Synchronized configuration: delete block.block.riley_block_30.
 [notice] Synchronized configuration: delete block.block.riley_block_31.
 [notice] Synchronized configuration: delete block.block.riley_block_32.
 [notice] Synchronized configuration: delete block.block.riley_block_33.
 [notice] Synchronized configuration: delete block.block.riley_block_34.
 [notice] Synchronized configuration: delete block.block.riley_block_35.
 [notice] Synchronized configuration: delete block.block.riley_block_36.
 [notice] Synchronized configuration: delete block.block.riley_block_37.
 [notice] Synchronized configuration: delete block.block.riley_block_38.
 [notice] Synchronized configuration: delete block.block.riley_block_46.
 [notice] Synchronized configuration: delete block.block.riley_block_49.
 [notice] Synchronized configuration: delete block.block.riley_block_51.
 [notice] Synchronized configuration: delete block.block.riley_block_6.
 [notice] Synchronized configuration: delete block.block.riley_block_61.
 [notice] Synchronized configuration: delete block.block.riley_block_64.
 [notice] Synchronized configuration: delete block.block.riley_system_main.
 [notice] Synchronized configuration: delete block.block.adminimal_search_form.
 [notice] Synchronized configuration: delete block.block.riley_block_50.
 [notice] Synchronized configuration: delete block.block.riley_block_52.
 [notice] Synchronized configuration: delete block.block.riley_block_53.
 [notice] Synchronized configuration: delete block.block.garland_block_39.
 [notice] Synchronized configuration: delete block.block.garland_block_40.
 [notice] Synchronized configuration: delete block.block.garland_block_41.
 [notice] Synchronized configuration: delete block.block.garland_block_43.
 [notice] Synchronized configuration: delete block.block.garland_block_44.
 [notice] Synchronized configuration: delete block.block.garland_block_45.
 [notice] Synchronized configuration: delete block.block.garland_block_47.
 [notice] Synchronized configuration: delete block.block.garland_block_50.
 [notice] Synchronized configuration: delete block.block.garland_block_52.
 [notice] Synchronized configuration: delete block.block.garland_block_53.
 [notice] Synchronized configuration: delete block.block.garland_block_56.
 [notice] Synchronized configuration: delete block.block.garland_block_57.
 [notice] Synchronized configuration: delete block.block.adminimal_block_39.
 [notice] Synchronized configuration: delete block.block.adminimal_block_40.
 [notice] Synchronized configuration: delete block.block.adminimal_block_41.
 [notice] Synchronized configuration: delete block.block.adminimal_block_43.
 [notice] Synchronized configuration: delete block.block.adminimal_block_44.
 [notice] Synchronized configuration: delete block.block.adminimal_block_45.
 [notice] Synchronized configuration: delete block.block.adminimal_block_47.
 [notice] Synchronized configuration: delete block.block.adminimal_block_50.
 [notice] Synchronized configuration: delete block.block.adminimal_block_52.
 [notice] Synchronized configuration: delete block.block.adminimal_block_53.
 [notice] Synchronized configuration: delete block.block.adminimal_block_56.
 [notice] Synchronized configuration: delete block.block.adminimal_block_57.
 [notice] Synchronized configuration: delete adminimal.settings.
 [notice] Finalizing configuration synchronization.
 [success] The configuration was imported successfully.