From
http://www.bikeboy.org/duccapacities.html Some notes for component swapping – not an absolute list by any means.
The cylinder stud spacing variations are:
‘Small blocks’ (small 2v),
‘Large blocks’ (900/906/907, ST2 and 748/851/888/916),
‘996’ (996, ST4S, S4R, 998/999/1000ds/ST3)’
‘Large Testastretta’ (104mm bore 998R/999R, 1098, 1198).
Swapping cylinders between the different variations is not possible. Well, not easily. The holes in the cases for the cylinder spigots to go into also vary.
Checkout the Desmo Due Paddock on Facebook