Much talk of GR7 and GR9 but the only difference between them is the software and 1760 wiring to all pylons (GR7 to 9 upgrade involved some excellent software improvements, part of the reason the USMC were impressed with them in the last Red Flag they took part in).
Genuine question; will the US use the same software IF they decide to fly the aircraft? My understanding is that they would not be able to.