You mentioned the ride height in the photos, like cynic said the blue one has a jack up kit, the front can be balanced up a bit because the stancheons go through the top yoke by 20mm or so, they even made extensions to screw into the top of the fork tube (aftermarket)
Also like cynic said the blue bike has an after market exhaust on it but the yellow bike is stock like yours
The side panels are correct for a 78 bike, I think you have most of a us import 78 DT125E, with an older DT front end on it