I think cm/m would solve everything. Cuts would go 10 to 400 on basic and 10 to 500 on pro. Engrave would go 10 to 850 on basic and 10 to 1000 on pro.
10cm is 3.94", close enough to 4.
400cm is 157.5", close enough to 157.
850cm is 334.7" close enough to 335.
In fact it looks like the original numbers were just centimetres converted to inches. Not surprising as the belts seem to be metric.
So the only change would be the scale starts at 10 instead of 100. The engrave cut scale goes to 400 instead of 500, but the pro will go to 500. The engrave scale will go to 850 instead of 1000 but the pro will go to 1000.