dfranke comments on Three consistent positions for computationalists - Less Wrong
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They're computationally equivalent by hypothesis. The thesis of substrate independence is that as far as consciousness is concerned the side effects don't matter and that capturing the essential sameness of the "AND" computation is all that does. If you're having trouble understanding this, I can't blame you in the slightest, because it's that bizarre.
(Didn't realize this site doesn't email reply notifications, thus the delayed response.)
What I'm saying is that someone who answers "algorithms" is clearly not taking that view of substrate-independence, but they could hypothesize that only some side-effects matter. A MOSFET-brain-simulation and a desert-rocks-brain-simulation could share computational properties beyond input-output, even though the side-effects are clearly not identical.
(Not saying that I endorse that hypothesis, just that it's not the same as the "side effects don't matter" version.)