The white vs. grey affects the first two series. In the first series, white is more common. In the second, white is more difficult. A handful of cards in series 2 carry gigantic premiums with white backs, regardless that it doesn't really make any sense for these cards to be any more difficult relatively to other white backs than any S2 gray back compared to other gray backs.
There are 5 combinations of each team card in the first series.
There are a number of variations with the pictures cropped slightly differently, evidently from redesigns of the cards/sheets for some unclear reason.
On top, there are a number of cards that one could argue are variations or are recurring print defects that weren't intentionally changed. Stat boxes obscured during part of the print runs, color lines above titling boxes on the front, different sized name boxes, etc.
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