Flywheel/rotor weight

Hi all.

does anyone know the difference between the 05/06 wr450f flywheel/rotor, and the 07/08 model. I was looking through the parts list and they have two different part numbers. would one be heavier? or are they totally different? I know Yamaha make slight changes each year to the 450 motor, but could these parts be inter-changed?

Thank Evan

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