Much of the difference is likely due to different settings in the scan. If you look at some minute details like the small dark spot on matty's left elbow it becomes apparent that the differences in vibrancy/color are not likely the result of a cleaning. If they were, why would a small dark spot on matty's left elbow point (typical for this card) appear after a cleaning? The scans produced a dark rendering in the sgc 6 holder. As for the spot in the upper blue quadrant, it is possible that this was residue on the card that sgc removed before putting it in the new holder if that was requested by the customer.
Upshot is different settings likely caused the majority of differences in the image of the card, and whether or not it has been cleaned is inconclusive. Why this is PWCC High End is the biggest surprise to me? It's a questionable 6 given the top left corner and has some surface and centering issues that impact the eye appeal of the card.
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