in general, there were many printing differences on backs of TCMA cards.
in other sets some are white back vs dark brown back from different card stock, some are white back with blue text on back, while others exist with red text on back.
I personally don't think we need two listings here, or parallels even. I think just notes on the cards set itself noting the differences, and some examples of the diffferent backs within the scans of the set itself when possible would be enough info for me.
Admin may feel differently, but that is my opinion..
mark