When taking another look at the Wikipedia articles for the XB-1 and the Overture, I also noticed that both of them mention the fact that the XB-1 still uses the original trijet engine configuration planned for the Overture, which has however since been changed to a quad-jet (https://airinsight.com/boom-supersonic-radically-changes-ove...). So the XB-1 is even less representative of the full-scale Overture than I thought...
they're early enough in their program to switch the Overture again to twinjets :)
(only half joking, if it turns out that adjacent engines in the quadjet configuration have a negative impact on their intake technology, a twinjet would work more similarly to the trijet...)
