If no friend and no family member can tell the difference between you and your digital twin, you are proably the same self. Not the flesh, but your self is not connected to it. You can not proove that somebody really exists, so if you can not tell the difference between the other and the clone they are the same. It has to be, because each time-stamp could be an unordered set of moments, like the frames in a video file.

Becoming immortal