In Photoshop, I laid the autographs (or the visible parts of them) on top of each other for comparison, and they are exact matches, so it's definitely a stamp job (I have plenty of them from Yaz and other players from back in the day).
With SGC, use the on-line submission form to mark it as "authentic only" (or whatever it is specifically) and in the the toploader you mail the card in, include a small slip of paper saying something like: This card is to only be labeled "authentic."
That will reinforce what you want and prevent errors from happening.
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