I can't fathom the board out tbf.
Now the 3 connections to the pot I see are: high, wiper & low from that board.
The way the 3 on the X2 work are: 12v+, wiper & 12v neg.
Whether this difference is the issue or not I have no idea.
Addition:
I noticed it says it's a PWM drive so maybe it doesn't give out the 12v supply the X2 pot needs to run. Odd.