900 to 1000 parts interchange anyone?

Ok I know the cylinder head is different but will they interchange?

Will the larger 1000 cylinders fit on the 900 cases?

Will the 1000 crankshaft fit in the 900 cases?

Has anyone tried any swapping of parts to see what all will change? A parts interchange would be awesome as im sure many of us 900 guys want to know what will and wont work.