the earlier 620 subframe used different plastic and a larger airbox that accepts the larger 450-525 airfilter/cage but has no battery space... but dont ask me bout this
I dont think the plastics match up as the earlier one had a flat bar across the rear and the newer has one with a punched out gusset that rises higher to add a little suspension bottoming room. You can add some type of spacer on the older sub to fit a new style OEM rear fender. But there is many threads on this in the thumper section especially one by laramie about different colors that the LC4 wears.
Thanks for the 2013 support: DUNLOP, BELL HELMETS, Kriega USA, Carbon-pro.com, Ride 100% Goggles, Renazco Racing, Sidi/Motonation, Acerbis USA,KLeN, FMF, Mx1west,,Masters paint and body, Magura , motolab , Tripy GPS and Freedom Cycle