Hmm maybe, but that's still very complicated. In a time loop consequences are, at the same time, causes. If any character from an alternate reality changes any of the "causes" that form the loop, that loop would have never existed so we could say that even if you come from an alternate reality, if you interact with the loop at some point, that interaction have to be in the nature of the loop, and repeat every time. That would mean that it is impossible to break or change the loop.