Did you swap your old brain for a new brain? Do you have a different set of eyes now than you used to?My trusty homebuilt PC sitting here allowing me to type on it has been in existence for about a decade now. I've reinstalled the OS at least twice that I can remember. I've swapped out hard drives twice. New video card. A couple different monitors. Same PC as before?
Early on I realized the case sucked, loud as hell and not enough airflow, so I got a new one. Same PC as before?
Oh, and I swapped out the motherboard a couple years ago, old one was getting hinky. Same PC as before?
Meh. I'm me, I always was me, up until I stop being me. My PC tells me it was always it, but only because I keep giving it the same name and telling it that it was still it prior to what it can currently remember, so it's only fair that I regard myself by the same standard.
No? Then your analogy doesn't really work.
I, on the other hand, no longer have the lenses in my eyes that I was born with. After my surgeries last year I have an artificial lens in each eye, and a card for each of them to show in case anyone ever needs to know. I joke sometimes that it gives me bionic vision like Steve Austin (it doesn't, but it's bemusing to see the occasional person have a "wait, what, really?" reaction), but what it really means is that I'm not blind, as I would have been if the surgeries hadn't been done. It hasn't had an effect on what my favorite color is or that I still perceive the key of B-flat major as purple.