My acquisition.

[Jonathan]

8 wires means the motor is most likely similar in wiring to the ones on your first machine, that is 4 windings and two per phase. You should be able to use the same method to identify the 4 pairs of wires for the 4 windings, then you just need to know which two are which phase so you can put them in parallel (or less likely series). I'm pretty sure you can safely do that by connecting to the driver and just trying the four possible combinations - one will just work and the motor will only go a couple of steps forwards and backwards with the others.

Is there definitely no part number on the motors?