Weirdly, the animated show Invincible addresses this a bit with the team of villains where one is a clone of the other and they’re always arguing over who the “original” is this time. Until one inevitably uses the other as a meat shield to escape… Only to later clone himself again and repeat…

They help the one “guy” (more just like a really smart, deformed clump of flesh in a vat) transfer his consciousness into another human body.

After the process, he mentions that he didn’t expect it to be so “continuous.” His first thought was “which one am I?”

Anyway, I thought they did a good job exploring the topic…