The bodywork of the 1200 from 2001-2005 is the same, except for colors and decals... and 1200 gas tanks all have fuel sending units, whereas the B6 didn't get a gas gauge right away. Speedo is the same, tach is different. While most of the chassis parts are different, most will interchange if you take enough parts... for instance, the 600 has smaller forks, but if you swap a complete 1200 front end, including the triple trees, it'll swap over nicely. Other front end swap (Gixxer or Busa) that apply to the 1200 will also work on the 600.