The 10r are the modern version (10 years ago!). They sound similar, but the 10r is a little more refined, mostly in tighter bass
Now I really want to get a 10R, as the 10-II has been monopolizing my ears for a while now. I just wish I could do something about the headband sliders; the plastic pieces are starting to crack. Has this happened to your pair? It appears to be a design flaw.