You're talking about the top boards for the amplifiers..
Those are all common boards.
The actual amplifier part numbers should be an A02B-60xx-Hxxx number.
The PMC runs the FAPT side (and other stuff.) Theres a manual for the PMC J, K, L, M, N... That I've been looking for PDFs for years of.. but its good reading if you use FAPT.. or any of the advanced features of your CNC.
It makes slight difference which label color you have on the CRT..
Is the model more like a O or a 0?
To use more than 4 axes you need a different AXES CPU & control boards. But basically the way it is set up now, no more than 4.
There are boards for 5/6, 7/8, etc axes..
I found that FAPT is better for lathes but its ok for Mills..