Short phrase translation to latin needed

Hello,

I would like to ask for a translation of "You're not them" or "You are not them" into Latin. I have tried a few sites but they all give different results, and what I really want is the most accurate and "natural" translation (Including the capital letters, V instead of U, which I heard is a part of classical Latin, but feel free to correct me)!
Also, is there a difference between "You're not them" and "You are not them" when translated to Latin? is one of them more correct than the other?

Thanks!

Maria