I can't add a huge amount to what's already been stated. I will agree with the differences in wood. I would add that true African M has a seriously deep and dark and very woody and resonant tone. If you don't get it by a major factor, you are probably lacking in drum tensioning skills and head choice. That "you" in that last statement was the generic drummer as opposed to a specific person.
The deep dark tone of true African M is something you will never forget once you play it. I'm NOT referring to a mixed ply shell where it shares space with poplar or maple. I'm referring to 100% African M shells. They are unlike anything else out there. Once you mix the plies, all bets are off.