Provided that the rear view photos do conform with their respective aircrafts seen on satellite imageries at Malan (WZ-X and GJ-X, respectively) -
The individual engine nozzles on the GJ-X do seem to be well separated from each other.
Hence, the observation likely directs towards the following points:
1. The GJ-X is powered by two non-AB engines of an unknown model;
2. The two engines are not placed side-by-side along the centerline of the aircraft (i.e. the two engines are physically separated from each other inside the airframe of the GJ-X);
3. Judging by the relative "bulging" at the centerline regions of said aircraft, there likely is a large-sized (if not a main) IWB situated at the centerline that is sandwiched by the aforementioned two engines, situated on either side of the (main) IWB; and
4. The presence of any side IWBs (similar to those on the B-21) cannot be ascertained.