In the coin world it is very common for dealers to assign 2 different grades to a coin, 1 for the front and 1 for the back. It is not done on graded coins though. I also see many folks describe cards like this. Perhaps it is something that should be considered.
As for the population reports, most TPGs want you to send in the label for them to remove the item from the pop report. I'm not sure how "firm" they are on this request, but I've never received any of my labels back. I've also sent labels back to a company when I send cards to be graded, and I have not seen a decrease in the pop reports. It's only been a few and there might be a delay in removing them, or they may have just graded the same card in the same grade. After saying all this, if the TPGs aren't serious about removing items from the pop reports, then I guess it will really never matter if they "talk" to each other.
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