If you have both and the Turbo engine is ok I would swap the lot. There are a few differences in the block for the oil drain on the turbo and the cam will be different. I did the swap on my 940. You will probably need the Turbo's wiring (engine bay and dashboard), exhaust etc. If your car has ABS you might need to swap all the brake pipes over as well to put the pump on the left hand side of the car. Fuel pumps will probably be different as well. It's a hell of a lot of work but if you have a complete doner car it can be done properly.