SGC and PSA having hi res scans after the cards are encapsulated is probably not the technology they rely on to identify previously submitted cards. In PSA's case they might be using the faulty genamint technology which is scanning, in the early stages of grading, attributes of the card to identify if a card was previously submitted. I don't think SGC has technology that they use in that capacity.
Since all steps of submitting rely heavily on technology I suspect it would be easy for a grader to access prior submissions to see if by chance the submitter is sending in the same card again but seems like a waste of time. PSA would be able to id the card as a previous submission based on the genamint scan much easier than SGC could.
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