That's a lot of years difference, one thing to look out for is the oil pressure sender is different between models with a oil pressure gauge (like the SR5 pickups and 4runners) and the models with a oil pressure warning light (like the base model pickups). Getting them mixed up may damage the gauge. There may have been a change in other senders or sensors. Almost certain the engine wiring harnesses are different, so you'd want to use the 94 engine harness and all the 94 sensors you can. The timing belt tensioner is different, but that may not effect anything with a complete swap.