The motor on the pictures id a 195oz with 2.5mH. Its lenght is 55mm. Model: JK57H56-2804-01. This will be my Z stepper
The three 1.6mH I have are model 57BYGH633 and have a lenght of 75 mm. These are 270oz stepper 6 wires. In order to hace 1.6 mH I wired them using only half the coils so they are in fact around 180oz. To have the full 270oz I would jave to wire them full coil which would give an inductance of 3 or 4, I don't really remember. With a 24v ps it made more sense to use half coil.
Not certain how I will wire them on the new machine. Maybe the X will be half coil using a 40v PS with TB6600 and the Y will be full using a bigger PS and my AM882 drive
Hope that help