I have been able to confirm that I have 4 variations of the 1991 Topps John Olerud.
1. Dark 40th Anniversary Logo - Glow Back
2. Dark 40th Anniversary Logo - No Glow Back
3. Light 40th Anniversary Logo - Glow Back
4. Light 40th Anniversary Logo - No Glow Back
All 4 cards have the A* print code on back.
I don't think the Olerud Card has a A*B* variation.
I looked at my 1991 O-Pee-Che Olerud cards and none of them have any different logos on the back or glowing backs. However, I noticed that 2 of them had a front that slightly glowed.