different sets...
There are many different sets that have different backs and the same fronts. Each has their own values and scarcity levels. In the T216 series there are 5 different backs. Each one has their own scarcity and value level. On M101-4/5 it is the same scenario. Blank backs of those are generally worth a bit less than most of the ad backs. Some ad backs carry a higher premium than others. It really depends on the specific set and ad on the back.
With your example of a Joe Jackson M101-4/5 having a blank back vs having a very rare back, you could be looking at multiples of value more for a really rare ad back...ie Holmes to Homes, Everybody's, Mall Theater etc....
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Leon Luckey
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