If time machines exist

assuming if they exist, then there is hope that we might meet our older or younger self, but they wont be exactly like us. I believe, if we jump from one time line to another time line, we may meet ourselves in the past, but these people wont really be us. They will be genetically identical to us, but will be a younger or older version of ourself in a parallel universe. We wont hav any time paradoxes. So if we change the past, we change someone else past, who is genetically identical to us, but is not really "us." Of course, we won't know for sure until we finally build a time machine.