As far as the E101/E102 fronts, I don't think there is a real way to tell the difference. Some other sets that share the same artwork, such as E105 (thinner stock) or E106 (the colors look less refined and 'blobbed' together) it is easier to tell. Since both of these subjects are in the E101 set, I would lean toward that. But then again they are both also in all of the different E92 sets, so why not that designation?
I am fairly unfamiliar with boxing issues, so no help there with the cool baseball fronts/boxing backs. Good luck on exploring the mystery of it all.
Brian
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