ferretbacon
Obsessor
It's not, though. They are significantly different entities.
For the purposes of the game, Kongo and Congo are the same. You can have the Kingdom of the Kongo and the Republic of the Congo combined in one civilization. Almost every civilization in the game does something similar.
Of course theyre historically different. So are the Vikings and Denmark, HRE and Germany, and the Kingdom of England and British Empire, but all cohabitate under the roof of one civilization.