b max4 factory vrs b max 4 III

[ofgofg]

Hi guys. I just bought a bmax 4 factory. I know its old by modern standards. I was hoping that some of the upgrades from the b max4 III would translate directly to the older car. Im mainly interested in the hard chassis, and the gear diffs. Can anybody comment as to just how much the older b max 4 can share with the newer 4 III?

Thanks!