Mike 33 is correct. One is #65 (no grill) and one #94 ("F" Grill). If you have a Scott catalog you should see that the 3c 1861 stamp was issued first without a grill, then in 1867 the grilled stamps started to appear, at first with the grill covering the entire stamp ("A" grill), then becoming progressively smaller in size until the smallest of the series (the "F" grills) was issued the next year. So when you look at a 3c 1861-68 it can be the following possible stamps - depending on whether it has a grill or not (one of yours does not);
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