I believe one is the real Superman and the other is Bizarro.
Which is who is entirely dependent on which thyme-line you are from originally.
Basically, CERN opened up the pohr-doll and naow we have this. I don't know anymoar if Mandela died in jail or not in my original thyme-line. I am certain, however, that they are still the Barenstein Bears, and refuse to believe any evidence to the contrary.
Suck on that lemondrop, WaterCloset!
-pAnon