Drupal 8 has a nice configuration system but what works how?
You cannot import configuration from an alien site
Sites are equal when their system.site.uuid are equal.
drush @drupal.d8 config-get system.site
You may try to force this with
drush @drupal.d8 config-set system.site uuid 213120bb-5af1-41ff-9316-22276f3077ee
Doing so will trigger an 278 new, 6 changed, 141 removed which is completely madness.
drush @drupal.d8 config-import
It's of course logical this does not work. You need the same source code to make this work to start with.