Here some small info regarding the 3MA gearboxes.
Mainly they have three different gearboxes
3MA-1 (first 3MA model)
3MA-3 and 5 (first upside down fork model)
3MA-4 SP (Sport Production model)
If you take the 3MA-1 gearbox as a base point.
The 3MA-3 has a shorter 5 and 6 gear compared to a 3MA-1 gearbox.
The 3MA-4 has a longer 1 and 2 gear compared to a 3MA-1 gearbox.