1991-92 Fleer Basketball is not a set that I’ve devoted much time to, but I recently purchased a 3200 count box in effort to find a mint Larry Johnson rookie (yeah, I know). While sorting through the cards, I found a large chunk of the series 1 All-Star issues and noticed that several can be found in two varieties: 1st variety has a pink background behind the text on back (common), the 2nd variety has a yellow background behind the text on back (scarcer). As of this post, I have not been able to confirm that every player is affected by this variation.
Junk Wax Gems 
are these possibly a variation by which pack type they were pulled from? i used to buy mainly the jumbo cello packs (for the rookie sensations) and i have a ton of yellow backs. going through my commons you would think the pink is the scarce type.
Agreed, I think yellow is the common and pink is the scarce. i just went through all of the Series 1 AS cards on COMC and all were yellow except for one pink Malone (most had 20+ samples). It does look like there is another variation on at least the yellow backs with two different fonts on the back, one bolded and one not.
I have a James Worthy with [2] differant colored fronts.
Have you been able to confirm a Dominique Wilkins All Star Pink Back?