His liver should still be available - any takers?
But it's true, Bruce sounds like himself shortscale, long scale, roundwound, flatwound, active, passive, fretted and fretless, Warwick or EB. More than his sound (which in its belching middishness can be replicated relatively easy), it's his sense of timing and phrasing. For a bassist, he's relatively often not on the beat, but plays over it. That is very idiosyncratic, kind of Carlos Santana on bass.