Good: it looks like standard everything!
Now you draw up a big table (a spreadsheet will be your BFF) with the controller terminals, starting on the far back of the left side and working your way around the case.
For example, the LASER block seems to have three wires that likely go to the high voltage power supply. Trace them to their destination and match those labels, which might look like this:
LASER Wire
GND Black HV Supply G
LAS- Red HV Supply TL
LAS+ x
PWM- x
PWM+ x
DA2 x
DA1 Blue HV Supply IN
Do that for every terminal on the controller.
Then you can figure out the corresponding terminals on the Ruida controller: some will be obvious, others may take some puzzling.
After you trace all the wires, post it here so the hive mind can think it over.