This is basically an unmanned version FRX-00.
It was devised by the FAF's Systems Corps as a hedge against newer and ever more deadly models of JAM fighters, the current examples of which outclassed most of the FAF's aircraft is it was. High Command was convinced that the key to keeping ahead of the JAM was to eliminate the "Human limitations" of it's aircraft (i.e., the pilots).
So, why is it essentially identical to the FRX-00? That's simple; it costs lots of money to build aircraft, and the FAF is on a limited budget. The unit costs would obviously be lower if two different designs used common components, and the same logic applies to competing designs (like the YF-22 and YF-23, which used the same models of engine). By integrating a modular cockpit pod into the FRX-series airframe, it is possible to make a manned fighter and a UAV with a 95% commonality of parts!
This is something the FAF had learned previously in developing the F/A-2 Fawn.