They should be just fine. Most of the cards from 68-70 come with both stocks. One is a regular light cream colored stock, the other is either a coated stock that looks very white, or they printed a white layer on the regular stock.
I haven't even completed those sets, let alone with both stocks, but I have enough to be fairly sure all cards from each set come both ways.
I haven't measured the thickness, it's interesting if the whiter ones are thinner.
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