I have a couple of older Spector NS-5's. Both have quilted maple bodies which I assume are made of wood of roughly equal density because the basses are within a couple of ounces of being idential in weight. The only significant difference in the 2 basses is the finish: one has an oil finish, and one has a poly gloss. My ears hear a subtle but real difference in the tone of the 2 basses: the oil finished one is not quite a bright as the one with the gloss finish.
Mike Tobias wrote this in a Bass Player article called The Quest for Tone: From Alembic to Zon:
There are cases when a piece of wood sounds significantly better with a certain type of finish. I remember building a bass that had a body made of very light swamp ash that received an oil finish. The instrument's tone was okay but a bit mushy and lacking crispness. For some reason, which I can't recall, we had to refinish the bass; the oil was cleaned off and the bass was shot with polyester. When we plugged it in, lo and behold--it had gained brightness and clarity.
The bottom line is that every construction detail of a bass will affect the tone, and that's why Alembic pays such attention to every little detail! It's also why their basses sound so great.