If you read her backstory, it's more that Saber is Saber (extra)'s copy than the other way around (though in reality is is more or less the case with the latter being made in the original's image.... kind of)
Heheheheheheheheheh.It's fine! Saber, you're fine as you are!What?In the first place, where is it that you and I are of identical visage?What has you angered so?Curse you, imposter!Doing as you please with a face identical to mine!Have a look, and look well.Heh...I won't stand for this any longer!here too.bwoii~iingC... Calm down, Saber.Completely different, are they not?Here anddazzleHow's that?