Sure it might be the same version as used in the game - but that doesn't say anything about being the "right" or "wrong" version. It's often impossible to tell which version(s) were spread by the original author or were modified by others, and being on AMP doesn't necessarily make it any more legit than being on ModArchive or the other way around. Without having any clear hint on which version might be the "right" one, I won't replace or merge anything in this specific case.