Board Thread:General Discussion/@comment-24751482-20141221181320/@comment-3974711-20141222084414

To directly answer your question, yes in theory, there would also be different versions of the other characters.

Talk of other dimensions though is a tricky thing, as Ben and Rex also live in alternate dimensions to eachother, yet have no equivalent in each other's worlds.

Anyway, alternate versions means that they are not the same character. The main Vilgax is marked as different because he alone conceived that plan.