Question: Why some Music Man StingRay Basses has a painted headstock? What this is means?

Question: Why some Music Man StingRay Basses has a painted headstock? What this is means?

I’m looking for a Music Man StingRay Bass and I’ve found a 1998 model that have a white headstock, but I’ve looked for another model of the same year and they doesn’t have a “colored” head stock. Someone knows why some basses has that difference in your headstock? I don’t have the serial number. Screen print attached. Thanks a lot!
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