wouldnt that make it run hotter and maybe more ware>?

Yeah ATF +3 does cause more slip so I guess more wear/heat.

The switch from Dexron to the ATF spec for Chrysler auto's came somewhere between the A518 and 47RH/1994 timeframe.
There you go, thinking with your dipstick again, Jimmy! This is quite frankly, the best advice: Whatever the dipstick says.

Mopar started using a new clutch material which begat the Chrysler 7176 spec (ATF+ whatever). A few years later they released a TSB spec'ing ATF+4 for all Chrysler automatics except a few specific models of which, the 1st gen trannies were included. The current Dex fluid is VI, a GrpIII synthetic and would be the most appropriate for any 727-based Chrysler auto up to and including the A518 1st Gen OD trans. DexIII would be fine as well, if you can still find it.

You can use ATF+4 in those trannies, but it will run hotter due to the friction modifier. You can even use the old type F if you are interested in getting the firmest possible shift along with a shift kit/valvebody for racing. If it says ATF+4 on the stick use ONLY that. Dex in an ATF trans will destroy the torque converter under heavy loads.

Bottom line: DexIII may have been factory fill, depending what clutches they built your early 2nd Gen trans with. In that case, DexVI is the current most appropriate fill. ATF+4 all others.
True answer: Only the rebuilder knows for sure. Did he use the OE clutches or subsitute the later type? That would seem likely, but... What were the OE clutches for that year? If it was a '94-'95, probably only the guys on the assembly line at the plant where it was built know for sure.