D-IFF, the first link resulted in an error message. I was able to open the 2nd link.
May I suggest you carefully read the 2nd link. Northrop Grumman paid to have the MRTT (which did NOT have a cargo door) flown to Dresden for the installation of cargo doors. This confirms what I stated earlier: cargo doors were NOT offered by Airbus and NG had to add them after the airplane was built and delivered to NG. Such mods are not cheap and add cost to the proposal. Also note that the article states that USAF part owns one of the KC-45s. Do you understand the significance of that fact? It means USAF financially aided one vendor in submitting a proposal to a
competitive RFP. That was one reason why the competition was tossed out and a recompete started.