Some of you are making us look like amateurs; this is therangerstation, not some Tacoma forum for gosh sake.
'94 is crossover year for the B2200; I am assuming the truck you are looking at "looks like a Ranger" if you squint a little versus looking like a Datsun hardbody. If it has twin I-beam front suspension, it is a Ranger clone. And can be lowered with the same "dream beams" you would use to lower a Ranger. Note: Find a '97 Ranger and grab the dual pot knuckles/calipers/rotors as part of the lowering process to get the better brakes.
'94 B2200 is a '94 Ranger with slightly different front clip, box fenders*, interior trim and most importantly the Mazda 2.2 litre F engine (probably a 12 valve). Also, unless truck is LX, it probably has manual steering.
So, the basic cab/doors/frame are 100% Ranger, so panel lines from a stepside box would match right up, assuming 6' box as do the bolt holes in frame (and noted you need filler hoses, bumper and tailgate to make the conversion complete). While, I would inspect frame for rust, I wouldn't be too worried, assuming it is an Alberta truck. If you need a long box; contact me, I've got a pristine spare.
The Mazda 2.2 can be found turbocharged in Ford Probe GT and Mazda 626 GTs of same era. The good news on that - it is a factory engineered setup so it has all the pieces already installed and they work together. And the 2.2 turbo was rumored to make its rated power at wheels (not flywheel). The bad news - you would need to redo the piping/intercooler set up for the B2200 - longitudinal vs transverse engine mounting thing; not sure about electronics (I would grab as much as possible from donor car).
*When Madza stopped selling Bxx00 trucks, Ford used the extra Mazda boxes to create the STX models - quick thinking solution to an inventory issue