I've found cards with different backs. The Abbaticchio brown sleeve card here has a Piedmont 150 back, and the one I have has a Piedmont 350-460 back (factory line replaced with "C.C.C. Reprint - 1988"). I checked with a card being offered on eBay and found another discrepancy.

This means the listed Magee Portrait name misspelled variation with either a Piedmont or Polar Bear back may be just one Magie Portrait name misspelled card with "normal" back variations within the set. And the same goes for the Ty Cobb Bat on Shoulder variations with Sweet Corporal or Piedmont backs.

The reprint set I bought recently was missing two cards - one each of the two variations above.