I don't mean to start anything, but I just can't let that statement go by. Its just not true.
Maybe you can't hear or feel a difference, but many people can. I've gone out to Nordstrand. Played more than one bass with a Maple or Rosewood neck. Switched them with the other neck. Everyone involved could easily hear a difference.
I might not make much of a difference in the long run on a gig, but there is a difference.
It would be VERY interesting to hear some examples of songs where Jamerson is playing the Rosewood board bass, (easy) and songs where he uses the Maple board bass. I'll bet you'll hear many of the same notes. (sorry, bad humor)