I hope you lot choose the same thing

[Paul the Human]

Ah... you're referring to the possessive part of self identity then?

As in, whilst A, B, C, and D are now instead E, F, G, and H: Z has remained consistent (and must continue to do so for you to be considered a "you" and not an "it", as 'Z' is your status as a person?)?

Close enough. Yes.

But would not even that eventually change (from an empirical standpoint... "you" will eventually ceaseate and rot into dirt)?

Yep.