Maybe he would be just like you up to the point the copy was made, after that you'd have different experiences (even if it is by having a different perspective

Maybe he would be just like you up to the point the copy was made, after that you'd have different experiences (even if it is by having a different perspective of the world), and maybe that's enough to have the sense of his own identify? Maybe you'd be the same in a fraction of an instance in time? Maybe you'd never be the same because the process of duplication is an experience within itself enough to develop a different self? Who knows :D