Probably a bit late, but I'll force my opinion down your throats anyway. :P
Abe's Exoddus's levels were made using a sprite set rather than individually, unlike AO. It helped to speed the development process up a bit. It wouldn't suprise me if they took a couple of gameplay vids and screenshots of it while it was in production before they finalised the levels.
Not that big a deal, though. It's certainly not a mystery.
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