The 03 has a different linkage that raises the rear end, to help steering in MX. The Pro's are actually putting the 02 linkage on the newer CRF's to lower the rear without putting the suspension further into the progressive curve of the linkage. They do this instead of shortening the shock. Your stock 02 with your forks raised in the clamps and correct springs and sag, and you should be set except for dialing the comp/reb valving. :thumbup:
P.S. I believe that the front half of the frame has the same geometry, they just changed the linkage and subframe for 03.