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The 'B' models have a firing pin block safety, the pre-B models don't. Also some of the pre-B guns have a Beryllium-Copper trigger bearing which was supposed to provide a smoother trigger pull. If you look at the slide a 'B' model will have a safety plunger for the trigger block (inside underneath)
Pre B's look like this. Among a few other differences, the most obvious will be that a Pre B says "Made in Czechoslovakia" on the slide and 75 instead of 75B. 75B's have a different hammer and sights and trigger guard shape. If yours is a 1992 it should be a Pre B.