No, a D10 isn't swm compatible.
The D10 recvr powers the LNB on the dish set up, while the SWM has a Power Inserter to power the LNB, now you Don't need a SWM unless it's something you want. It basically makes life easier with only needing 1 line to each dvr recvr.
Sure, as long as it's one of the compatible models. Virtually all H and HR models are swm compatible.