same engine, different camshaft for an extra 5bhp. Usually fitted with a different dizzy too but the 2wd 1000s aren't all the same either depending on age and what the Fiat robots had lying about at the time.
Thats cool, so if I have to replace the engine in my 4x4 (think piston rings just shattered), then I can use one from a 2WD 1000? Without loosing the 4 wheel drive of course...