I would expect the density of the material to provide just that. Even my Kalamazoo KB-1 with its wood chip body sounds different to other mudbucker basses of the era. Deeper, but with less mids. Deader too, but with better G string definition.
A couple of years ago, ok more than a decade, Ibanez brought out a new material, what was it called again? Something with an "L" like "lucite" or something? And used it on basses that had a suitable modernistic design. I played one of those because I Liked the looks. It sounded dead, but the sublows were merciless. Even unplugged you could feel the density of its tone.