NoVANav
Give it a rest! The modified aircraft are NOT different, except for the retention of water heaters for the required UK "brew-up" requirement.
So what is the Boeing model number of the UK aircraft?
A number of USAF C-135B-04-BN, Boeing Model 717-166 were converted to RC-135M then RC-135W.
New build RC-135-01-BN, Boeing Model 739-445B subsequently became RC-135C, then RC-135V or U.
UK purchases KC-135A-27-BN, Boeing Model 717-148, subsequently converted to KC-135R, and now converted to RC-135W by L3.
Are you saying that Boeing had 'rebuilt' the aircraft from the ground up to a different 'Model' standard?
SS