Looks like there's absolutely no difference between the two. This also explains the same tag price in the showroom. In 2003 the ZX 6R was available in black. In 2004 Kawi stopped the black version, which is still available somewhere...
I checked several sources. Unfortunately the rear suspension is something they should've changed, but didn't.
So only difference seems to be a new set of stickers on a completely unchanged bike
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