Your front brake caliper fits the following:
FITS 97-00 KX80, 01-12 KX85, 97-12 KX100, 00-10 KL250, 99-01 KMX125
So, even the the caliper assemblies have different part numbers it stand to reason that you could use all the way through 2012.
If you try it and find otherwise I would be interested in knowing.