Is there a way or online examples of automatically loading a CNC program based on an integer value set to Mach4?

I have a new CNC that we are building that will have multiple jigs for different product. Each jig has a coded plug attached to it. When plugged in, the PLC knows what clamps and sensors to use and can send a value to Mach4.

do a search for 'Load Gcode'.. lots of information available and examples that should help.