The RAAF has gone the other way namely B737 AEW&C has been designated as E-7A Wedgetail and our A330 MRTT's as KC-30A's and our yet to be delivered Gulfstream 550 ISR birds are known as MC-55A Peregrine. This allows them to fit in easily in the US military database as known types. Many moons ago USAF exchange officers flying Mirage 111O had trouble entering their flight data in their system as the system couldn't take a name or abbreviation.