it stores memories and experiences that the fresh parts wouldn’t have
What if we place the human fresh parts in the exact molecular state, that the original is in ? If my understanding is correct, our memories are somehow encoded with whatever chemical biology is happening in the brain, and if we suppose we can imitate those chemical states with the fresh parts, shouldn’t we get the same memories/consciousness ?
Good question. I’d postulate they have some equivalent for a brain : if not a chemical one, maybe a very intricate mechanical one. Anyway, if it has something that works as a brain, we could theoretically recreate it. But this is only hypothetical of course. We could also say it has just a soul, and then your theory would be back on tracks (pun intended)