How to resolve configuration objects lang code differences?
I'm not sure I can help but I had a similar issue.
After enabling translation for pages, I got a similar error in admin/structure/types/manage/page/translate:

The configuration objects have different language codes so they cannot be translated:

node.type.page: en
core.base_field_override.node.page.title: pt


I think this happened because I was by mistake in /pt/admin (?).

Anyway, I fixed this (in my case, I always want en), by running the command:

$ drush cset core.base_field_override.node.page.title langcode en