Board Thread:General Discussion/@comment-26348018-20150426235208/@comment-25555436-20150427175824

Well, actually, that would go against Canon. You see, there are no alt-versions of each Servant, they are all the same. The Cu Chulainn from Fate/Extra is the exact same one from Stay Night, and so on.

Unless you count each class a Servant can be as a different version. In which case Berserker/Heracles could have like 5 alts: Saber, Archer, Rider, Lancer, and Assassin (yes, he can be an Assassin. Don't ask).

With Vlad Draculae and Caster of Black is somewhat different though, because they aren't the same character. One is RL Vlad Draculae that liked to impale people, the other one is the vampire.

As for the Saber clones, the ones confirmed so far are Red Saber and Saber Lily, and Saber of Red that I think was Arthur's "son" which justifies how they look so similar. Shielder is not exactly a Saber clone, just someone that looks similar, but still different.