Note that avionics and sensor packages may not be the same across all allies (US tends to withhold their best sauce for themselves, second-best for closest alli

Note that avionics and sensor packages may not be the same across all allies (US tends to withhold their best sauce for themselves, second-best for closest allies and so on), so not quite the drop-in replacement. Although admittedly avionics are less likely to require replacement in the field.