Ok, different. But will they be close to each other?
Quick answer:
1: Motor has an established RPM
2: Manufacturer generally gears that
3: Drives it with a AC: frequency drive controller or DC: motor controller
4. Software displays a number sometime 1-10, sometimes f/pm sometimes slow/medium/fast
Unless all items are identical than "no" could you calibrate them all and make them all the same through software, "yes" assuming AC only and assuming the incoming voltage is consistent or the there is a built
Conversion factor ("see dryer belt timing change issues for explanation")
Hope that helps