To the best of my knowledge, the colors on the plastics is about the only thing that's changed from 2008 through 2014.
So I see no reason why a direct swap couldn't happen rather easily.
disclaimer : I don't know that for a fact...but that's all I've ever heard
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs