It could just be the fact that one is in an SGC holder and the other in a PSA. I had a buddy that collected the 1933 Goudey set and wanted every card to be in a PSA 6 holder. He wouldn't accept a PSA 5 or a PSA 7. It had to be a PSA 6. He would buy SGC cards and attempt to cross them as PSA 6's. Some crossed, some didn't. If a collector is doing something like that for PSA 8, they may be willing to pay a premium to avoid the hassle. Don't know for sure, but it's possible that's the reason.
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