Khalil's_Black_Excellence
The King of Fighters
They basically made two games, Nier Gestalt and Nier Replicant. Replicant was for the japanese audience about the brother and sister and Gestalt to appeal was for the west.
Both games are canon, sort of.
So between those two games, was it only the story that was slightly altered or was the entire game different, from cast of characters to locations, bosses, etc.?