halas,
I beg to differ, its like saying if your endorsed on a A90 you can fly a B1900 or B350, they are both based on the same basic airframe.
To give you a closer example, for the B747, the civil certified minimum crew is two, for the military varients such as the VC-25A or the E-4 they have a crew of 26 or 114 respectively.
Whilst they may look the same as a A330 from a distance, I think you will find it is significantly different to civil models like the 737-700 (civil) and the 737-7ES (RAAF Wedgetail military AEW&C platform).
I would see changes to electrical and fuel systems to look closer like a A340 schematics, internal wing changes, additional plumbing, and aerodynamic and structural mods for booms, number of crew etc.
Mil aircraft tend to have different maintenance and operational limitations than civil varients.
Love to get a photo of the Wedgetail being refuelled by the MRTT.
