Ned Block's own distinction between access and phenomenal consciousness shows functional equivalence is compatible with phenomenal difference, making the conceivability step do no additional work.

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Functional equivalence(as used in philosophy of mind and logic): When two different things work exactly the same way or produce the same results, even if they're different underneath.
Ned Block(as a philosopher studying consciousness): A contemporary philosopher who studies consciousness and the mind; he's known for arguing that our conscious experiences (like seeing colors) might be fundamentally different from what we can logically imagine or prove.
Phenomenal difference(in philosophy of mind): A difference in what an experience actually feels like from the inside—how two experiences seem or appear to you subjectively.
access consciousness(Contrasted with phenomenal consciousness as one of the 'easy problems'): A form of consciousness whose dynamics can be explained in terms of the functional or computational organization of the brain

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