Are the cone spacers for the rear wheel all the same size for all Ducati's or is there a difference between models?
There will be some parts sharing across models of the same axle diameter/era. But even then it’s best checking a parts fiche /supplier to confirm. These chaps have online parts fiches you can browse https://www.stein-dinse.com/en/ducati/category-1-191.html
Is your question focussed on the 1200 Monster ? I’ve had the big bore axle, rear wheel from the Panigale V4 fitted to my Multistrada 1200 and I’ve looked at Monster 1200 and Panigale 1199/1299/V4 rear wheels for my track Multistrada 1200 on the assumption the nut, cone and washer are interchangeable. Andy