I guess we will never know for sure, but it seems logical to me that one back was from the "team" set while the other back is from the All Star set.
Especially since all but three PSA says (incorrectly in my eyes) All Stars do not have the different Bio's. Seems to me if 9 of the 12 All Stars have different Bio's that there was a different printing for the All Star set which would account for the Mays and Santo different backs.
Now we have to find a Bunning with a different back!
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Fr3d mcKi3
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