User blog comment:FairyRaven/Fairy Tail Chapter 426: Black Heart, Review and Commentary/@comment-25111584-20150330130145/@comment-25111584-20150330164743

@Nick: Ummm, what? I stated that the young Mary knew Gray's name and his Magic, so she should act quite familiarly with him if she is the same person. There should be no issue of not recognizing him. Their interaction makes it seem as if she knows him just as well as the other people, doubting him and whatnot. My argument was supporting the fact that Mary and Mary (Ice Trail) are different people.

That said, I still think that they're the same.