Mini-z is 1/24, if they are M car, then should be 1/18.
Mini-z MR02/MR03 just like pan car, rear wheel drive, link up rear sub-frame with T-plate & ChaCha, rear ball differential.
Mini-z MA010 is a 4WD shaft car, with front & rear gear or ball (option) differential, 4 wheel individual suspension. Very similar to 1/10 layout but in compact size.