Forum:Byakugan and Sharingan

Hi there. The first thing is - I'm from Poland and my english is not perfect, sorry for that. And the second one is my problem: There's a Shadow Replication technique(or Kage Bunshin).

Does Sharingan distinguish these replications from the original body or not? The same question is about Byakugan; why? why not? Thanks for help.