I could be wrong but I think the difference is not in the harness but in the exposure protection. If both rigs were set up at the dive shop while the OP was wearing street clothes it makes sense the travel rig will fit better because he is not wearing as thick exposure protection. The BAUE photo shows the adjustment in a dry suit not in street clothes. Another possibility is the slots for the straps may be different on the Ghost, from what I remember it uses a rather unique backplate.
The slots look the same. The two harnesses are different by virtue of the padding on one which appears to more than double the thickness and probably the stiffness.