That right there is an Azteeg X3 Pro. https://www.panucatt.com/Azteeg_X3_Pro_p/ax3pro.htm
Specifically, it is a clone of an Azteeg X3 Pro. The genuine boards have screw terminals where the clones have Molex 4-pin headers.
coolmuscleCM1.JPG
As others said, the expansion board should work but it is difficult to say what sort of cost/benefit ratio you would be looking at versus getting a replacement Azteeg and trying to figure out the firmware.