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PCJames: the auction details for the reprint say the poster measures 16x11. The poster in the auction you won apparently measures 15x11.
Note that the reprint is taller, yet the print on that poster comes much closer to the margins (top and bottom) than the poster you won. This means not only that the reprint used taller paper stock, but it was enlarged to fit the stock.
So, assuming your item measures 15 x 11, it appears it is at least "different" than one of the known reprints. That's promising, but of course, there could be more than one style/size of reprint.
Please let us know if you ever find out for sure.