I see that Mon Cal use a similar greeblie as the one you found on both comm pad and chest box.
Indeed, the greeblies on the chest box and comm pad could very well be the same type, but I am convinced that that Molex connector you and Mon Cal found is the wrong type for at least the comm pad.
which is used by both the imperial crew and the AT-ST drivers (not seen on screen)
I designed a belt buckle cover to be used on top of a the large Tandy belt buckle blank along with the compad. I uploaded the belt buckle to shapeways and updated the compad model slightly. I always sharpen the features a bit because the printing and paint process dulls them.