Well there are huge differences in this protoype as compared to the final release, all the names for the levels have changed just like the previous prototype that was found, the moon music is definitely alot slower which is way better IMO, the coffins in Ghost house/Transylvania have crosses instead of RIP, the alien sprites are changed, the dialog box is in a different location and dialogs are changed throughout the game, Gizmoduck is Robo-duck and the list goes on it's pretty much the same as the other prototype that was dumped/found a while back, might have some slight differences, but looks fairly similar as far as I can tell. This is definetely the coolest proto I have. I had the chance to see the minibosses show last night here in seattle and I was telling them how kick ass the music was for the game and how I was playing a prototype of it that I found, I nearly crapped myself when they got on stage and not only did they play the NES rendition of Ducktales, but they played it 5 times thoughout the course of the show, it was freakin awesome and totally made my weekend.
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