On players that aren't repeated between the two sets, the 1943 cards have a typeface that looks like handwriting inside the baseball on the front of the cards, where the player's name is. On the 1949 cards, that typeface looks like typewriter. With the others (Boudreau, Williams, Henrich, Feller, Reese, and DiMaggio), you'd have to rely on the biographical info on the back, or the card numbers.
-Al
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