do you have any 2 that are the same? I believe you should have 2 of the same stepper for your X and Y axis. other wise it may not do certian moves right, like cut circles. as for the z axis a different one would work fine. Do you have apicture of the motors? Im just curios to see them. How many amp and volts are they?
If those steppers came out of regular bubble jet prints I dont think they are going to be powerful enough to run your machine.