[BadToTheBown]

Just to add to what others have pointed out above, 2 basic differences between these and they are driven by Front rotor size and ABS ring design:
1) earlier bikes had 305mm rotors, later had 320mm rotors, the earlier bikes had Brembos, later had Toniko [sp?] with BMW cast on them - the problem was the rotor diameter and the large rotor mounting base circle that interfered with the rotors mounting bosses (ask me how I know), without the rotor mounting boss relief cuts, look at picks of the early front wheels vs. later, all the 305mm wheels have big relief cuts in the rotor mounting bosses to clear the calipers, since the Brembos and the Tonikos have a different mounting arrangement/spacing, the calipers are specific to the fork ends (i.e. early are different than later)
2) early ABS rings are cast and much thicker, therefore the wheel rotor mounting bosses are cut further down as pointed out above, later ABS rings were stamped (much thinner) and can be shimmed up to work on earlier wheels or used with stamped ABS ring as is if using a later wheel on an earlier bike as you want to do - BUT re-read #1 above if you do this and what to use the later wheel on an earlier bike, if you want to use 320mm rotors wheels on earlier 305mm rotor bikes, you also have to swap the rotors and forks as well, heads up

Hope this helps and best of luck...