Don’t get me wrong I know pickups will
sound slightly different especially if heard solo’d and trying to analyse the tiniest of variation but in reality, behind a band, probably barely noticeable.
A fretless jazz bass is a close approximation. Add epoxy to the board and you’re pretty much there. Wasn’t a fair part of the Jaco sound down to his back line too?
If it’s all for sh*ts and giggles what does any of this matter 😄