...Now in the case of reproducing a person, this isn't actually possible so we are talking theoretically. But supposing we could reproduce you, together with your memories and experiences, then at the moment of replication there would be one 'you' and one identical copy of 'you' - and nobody, not even the two 'yous' would be able to determine which 'you' was the original and which the copy. Each one would believe themselves to be the original, but they still have two separate consciousnesses.
Those two separate but identical consciousnesses are both you, one is original, one is a copy and they cannot be distinguished. After the moment of reproduction, the two selves would immediately begin to diverge and become more and more different. However, this would not help identify the original from the copy.
However, as I said, this is theoretical as in the real world, such reproduction is impossible. Even identical twins have different observations and experiences in the womb. ...