The Lichuan is doable using the keypad. It's a ballache but doable. I only needed to do a few bits for analog spindle control. Never tried the debug software (yet).
Do you have the driver disc and tx/rx usb/lan cable?. Did you change drive to master not slave and check baud rate?.
Not sure about mixing drives.
Craig (joeavaerage) is you best bet to ask. Depends how the wiring plugs are set up on the 2 units.