GS Discs on Rockster Wheels?

[Udders]

Are they swappable? my GS is an 02 model and the rockster wheel is off an 03 bike. I think I'm right in thinking the ABS ring is different and speedo drive but will the discs fit?

 

[Den]

I didnt think the rockster front wheel had a speedo drive. Might be wrong though.

 

[Mallard]

My 04 Rockster doesn't have a front wheel speedo drive

 

[Udders]

Still doesn't answer my origional question about the discs though.