Correct, only some items cross over. There are quite a few differences between the 821 and 1200.I think that some of the accessories available for the 1200 would be suitable but others, no.
We also offer Ducabike levers at $250. They have adjustable reach and are folding: Ducabike Ducati Hypermotard & Monster 821 Brake & Clutch Lever Set: L07I want adjustable shorty levers… The only ones I'm seeing out there so far are these, which are beautiful but essentially $300. They do say that it works for the Hypermotard also, so I'm wondering if I could go to another site and search for the Hypermotard and be good to go…?
Rizoma RRC Ducati Hypermotard & Monster 821 Adjustable Brake & Clutch Lever Set: LBR503/LCR503