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Josh K.The cards are definitely the same - as noted earlier, stains are like fingerprints and to have not only stains in the same places, but also in identical circular patterns on two different cards is extremly unlikely. If you look at the backs, in addition to staining, there are two print dots on the top border that match up exactly - that also suggests the cards are one in the same.
As for the corner, in addition to cropping (which I happen to think is the case here) someone who is an expert at photoshopping pictures could easily cut out a corner on another card, resize it, and paste it onto the stolen scan to "create" a new corner. With the poor quality of the stolen scan, it is unlikely you would ever notice anything that would clue you in that the scan had been photoshopped.