[Retra]

Identity isn't what we're measuring here, it's "humanness" or "consciousness" -- things that are behaviorally distinguishable. Up to an abstract categorical similarity.

Thus they only need to be indistinguishable up to some feature of similarity that allows them to be classified in the same group. That's why, for example, we don't have to worry about "A is the same as B except that it is 2 meters to the left."

[foldr]

OP was saying that P-zombies are "the same" as us in virtue of being indistinguishable from us. I was just pointing out that this inference doesn't go through, since two non-identical things can be indistinguishable.

[Retra]

Ah, ok.