Yes, there were FFR lightweights.
As for which is better to have, the 12v would be easier/cheaper to source parts for.
(if you get the FFR, I have a 24v emergency flasher I'd like to sell)
Most mechanicals are the same.
The half-shafts are shorter and 24 spline. However, you can fit civvy half-shafts if you also change the drive members, which are also different.
Electrics are for the most part different, though the turn signel/horn/dip switch stalk is the same.
Keep in mind the Lightweight is narrower, so no body panels will swap with the civvy, though the door tops, hard top and 1/2 cab will fit (with a bit of fudging for the latter two).
Four wheel drive allows you to get stuck
in places even more inaccessible.
62 88 reg
67 NADA x2
74 Lightweight - The Antichrist (tag 6A666)
95 D1 - R380
95 D90 - R380
97 D1 - ZF