https://wccftech.com/dark-souls-remastered-prototype-bloodborne/

Bloodborne, the PlayStation 4 exclusive game developed by From Software in collaboration with Sony Japan Studios, has been released years after the original Dark Souls, but it seems like the development team had already been working on the game way before its release, as confirmed by something that has been discovered in Dark Souls Remastered.

A modder has recently extracted a map of Bloodborne’s Upper Cathedral Ward from Dark Souls Remastered and later imported it in Grand Theft Auto V. Twitter user Lance McDonald confirmed that the early Bloodborne location was created back when Dark Souls has been in development, and it’s not a new creation of the remaster team.