I opened 100's of 66 football packs as a kid. It was the first set I ever put together. Straight from boxes at Lefty Harry's corner grocery store. I looked at some of those in my collection and all had pure white backs. As I upgraded the set over the last 15 years I noticed that the stock and color is different no matter how good the condition of the card is. I only upgraded to mint cards to replace some not so minty ones.
I lived in Buffalo as a kid and my only conclusion is:
1. Cards exposed to different temps and weather browned differently?
2. Different paper stock was bought and used by Topps as more cards were printed. Maybe a different supplier?
I have to lean to 2. We know that variations of the print happened on different runs. (red line-no red line variations on the back) I'm sure uniformity in card stock was not a concern.
Who knew that us OCD collectors 48 years later would care?
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