7i92 pin file pinout?

I'm trying to wire up a 7i92 to an mx4660 and a generic relay board.  The pin file and pin out are confusing me.  Where do the pin file numbers come from?  For example:

Mesa manual for 7i92 has P1 HDR26 connector pinout #14 as GND
If I reference P2 pinout HDR26 14 is DB25 pin 20, also GND

When looking at the pin file for mx4660 
pin 14 is io 18 and with a secondary function as PWM

If I use the logic that P1 and P2 are duplicates of each other then PWM on both pin 14's, and io 1 and 18, would indicate that the pin file is the DB25 pinout and pin 14 in pin file is Pin 2 on the HDR26 (IDC26?) pin out.

TL,DR I need to use the P2 information in the mesa PDF to translate the pin file to HDR26 pinout. 
 


​​​​​​​Thank you.

Pin file pinouts on 25 pin FPGA cards always use DB25 pin numbers.

If you are connecting to a MX4660, the pinout is 1-1 from P2 so
just a normal flat cable is needed.

Thank you, P2 is not a problem. I somehow got twisted around on P1 since it's connections are on HDR/IDC26 breakouts.

I'm using the P1 io for the extra IO on the MX4660 and to feed a set of relays to feed an ATC.