Interesting question. It is true there are variations to virtually every Topps checklist in the 60s and for much of the 70s, probably for the reason you mention, their double printing. But have no idea how to identify the "teaser"
But we do have a lot of sheet experts on here who might be able to help out.
Some of the differences are very noticeably and some likely intentional, but many are just cropping difference, some very minor resulting from the DP.
The 68 situation is complicated in that the Topps 1968 Milton Bradley set also has the two Marichal varitions you mention
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