Thanks for the replies. Based on what @quuador recently posted here in regards to red vs yellow cheeks it would be assumed that the variant was a correction some point in production. I suppose designers could have overlooked the change and put 2 of each version of the card on a sheet. Seems odd but possible. I suspect one way to find out more concretely is if you can find both Yellow and Red cheek variants in a single booster box. If so then they’d have to be on the same sheet, if not then not likely…
Edit: after watching a couple booster box openings it does appear that you can get yellow and red in the same box, but doesn’t happen all of the time.
If what Gary stated is true where it is a close 50% of yellow vs red cheeks you have to take into account that Zap starter decks (and associated sheets) would have swayed this number considerably in favor of the yellow cheeks variant. Just another variable to consider.