There are differences like TPS (2wd are different to 4wd), some have lambda some don't - easiest way is to get a new loom from someone like Ryan (Carlooms UK) as most 2nd hand looms will be degrading by now.

I think they are about £350 and you'll need to tell him what ECU you will be using: L6, L8 or P8.

Hope that helps