Board Thread:General Wiki Discussion/@comment-4969948-20160404201742/@comment-5101200-20160429163446

The way I view this is that no matter what franchise or canon you're looking at, each of them are different fictional universes/timestreams where different things happened in each, from one small difference (i.e. Ben's favorite color being green in one universe and blue in another) to one huge difference (i.e. Vilgax being the bearer of the Omnitrix), meaning all of those still exist, but us seeing them again depends on if they want to revisit that idea with Reboot Ben.

And even then, I doubt, if they do appear, that they'd mention having met alternate Bens before, as they'd probably be a different canon of whatever alternate it is.