You're putting the carriage before the horse here.

Consciousness first, body then. Consciousness is consciousness regardless of whatever body it is. It's molded by the body but is is what it is. New brain, new memories, new nervous system, new feeling, ect... That's kind of how the reincarnation thingy explains why you don't get to keep memories from previous life in buddhism btw and it kind of make sences. And is a bit fallacious and dodgy too as it kind of nullify the appeal of reincarnation when you first learn of the concept. It ain't a restart button at all. More of a "things stay the same in a constantly changing world" impermanence trick.

So you could rez a completely different consciousness into a VR game and it would still act the same as the being you resurected as long as you "built" it right. The problem here is not knowing if its "you" but if there is a "you" inside that VR avatar. That's an aspect of the "brain in a vat" thingy. How can you be sure that others are real when all of reality is merely a projection of your brain. How can you be sure you are even here is another nasty issue.

Ego Death is a thing afterall.