Oh, just the anime? Bah.
Anyway, there wouldn't be any difference, lest you feel like figuring out how it could happen without some kind of paradox. (Particularly in the case of Wiseman and the Dark Moon family being handled more effectively, as suggested by Claymade.) And if you avoided that issue by going the route of branching into alternate universes, then we're not really talking about a linear comparison, are we? In which case, I fail to see the point of comparing them. Well, unless this topic happened to be in the Fic Research forum...
As for why the sailor senshi aren't in their super forms in R (same as in the manga): that's because the series hadn't been planned to take into account future events, as they hadn't intended to go beyond R until after the fact.