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Oh sorry, got carried away.... 
Why would maple be brighter than rosewood?
A local bass player put a maple-fretboard neck on his Blacktop & said it was brighter, but from the audience I could not hear a difference.

Because the internet says that it is.
Rosewood is much harder than maple, but it has an open grain, where maple and ebony are closed.I've always heard that RW produces a warmer sound than maple. But I recently saw a You Tube video by a member here who brought out that RW is harder than maple, based on the Janka hardness scale. He suggested RW produces a brighter sound.
Janka Hardness chart for Exotic Wood and Domestic Wood | Bell Forest Products
This video demonstrates pretty well what difference body and neck/fret board wood will do for your tone (especially notice how much the brown maple neck/fret board with ash body stands out. The newer Japan made bass with basswood body comes close in snapyness since basswood also is supposed to be mid heavy like ash, but still not quite there, as it lacks the maple fret board which is supposed to emphasis the treble and mids response as well.)
I guess Killed_by_Death is right though, won't make much of a noticeable difference in the mix.:
No sonic difference whatsoever, unless the placebo effect sways you significantly.
It will look different though, as long as your vision is in full working order.