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Ok, so I was finally able to look up some part numbers and find out a few things. First, "93+" for purpose of brakes means it was built after Jan '92 and "92-" is built before Jan '92. I'm not sure whether cars built during Jan '92 are considered '92 or '93.
The actual pistons on the '92- and '93+ turbo fronts are identical, so the '93 caliper shouldn't give you any extra clamping force (afaik). However, the pads are different, so may have more surface area or something (not sure what the difference is, just that they are different part numbers). And again, the calipers are more massive on the '93+.
The front rotors, rear rotors, rear pads and rear calipers are the same on all NA's and '92- turbos. There is a second part number for each part for '93+ turbos.
Brake master cylinders get complex, because the ABS and sunroof options makes a difference (the sunroof stores in the frunk, so the booster gets moved out of the way or something). There are 10 MC's; each of the following for ABS, then again for non-ABS: '92- NA w/o sunroof, '92- turbo + '92- NA w/ sunroof, '93+ NA, '93+ turbo to Nov '93, '93+ turbo after Nov '93
Five different brake boosters: '92- NA, '93+ NA, '92- turbo, '93+ turbo w/o ABS, '93+ turbo w/ ABS.
Note: there are certain '93+ turbo parts that have 2 part numbers. However, the earlier parts are superceded by the later parts; if you buy from Toyota, you'll get the later part, even if you're getting it for the earlier manufacture date, but if you buy it from a used car, you may get the earlier (presumably inferior) part. The parts affected (I probably missed some) in the Aug '92 cutoff: rear rotor, front rotor, parking brake cable support bracket*. In the Apr '93 cutoff: rear pad. (* The e-brake bracket actually affects all years, turbo or non.)
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