A twin does not have a shared memory history with yourself, though. I don't think its a stretch to say that two brains with the same memories are in fact, the s

A twin does not have a shared memory history with yourself, though. I don't think its a stretch to say that two brains with the same memories are in fact, the same person identity-wise. It is why we are considered the same person after having a seizure, or falling asleep, or waking from a coma (or any other consciousness-halting event). We're even more liberal with the concept of identity in society -- consider that I share nearly nothing (physical or memory) with 1-day old me, yet we are considered the same person.