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I think it would be a far more complex to match the curves... I don't think that they would fight each other unless the loaded speed of one motor is greater than the no load speed of the other. The only question I have is the effieciency
I'm no expert but I this is what I speculate:
The combined speed would be higher than the loaded speed of the slower motor by itself. The motors would balance the load between them on some ratio based on their torque and speed curves. The low speed motor(A) would do part of the work, because the higher speed motor(B) normally spins faster, it adds more power. Since B is now outputing power it increases the speed. The speed increases and A spins faster because B now has part of the load. This would come to a balance at some point for each voltage supplied
You can attempt to match the curves slightly by scaling the output variables to each motor. I don't, however, see the need to do this. I find it hard to believe that you will need more power than a drill or CIP can provide.
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