You need to be more specific with years. There are Type-1 and Type-2 S mint marks for the 1979 and 1981 proofs and there are also Type-A Rev and Type-B Rev for some of the pre-65 silver issues.
As for the Type A and B reverses, the Type B is a proof reverse used on business strikes from 1956(?)-64. The main pick-up point the is ES in STATES on the reverse- on a normal Type A rev, the ES are touching but they are separated on the Type B(similar effect as seen on the close and Wide AM Lincolns)
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