I spent a couple days studying the two original Comms that John used to make the kits while he had them. They had black paint smeared in with the glue that held the shells to the mid-plates in places (only where contact cement was used, the epoxy did not seem to smear the paint). You could not really tell from looking at the shells they were painted, It was likely only there to even out the sheen.
The back popped off of the assembled Comm and that one had the black in the glue also (it did not look like it had ever been apart <- actually I take this back, looking at the photos again you can see that the shells were glued first with what looks like Epoxy and then re-glued right over the Epoxy using industrial contact cement) so I think the paint was always there (no way to be sure but they would have had to be completely ripped apart to paint with no over spray.
The one in the upper left scene is the one that is in the scifi museum. Notice there is no screw hole and there are groves in the lid hinge wheels (pretty sure Wah was originally going to try to wrap the wire over the hing wheels and solder them but decided to go with the drilled holes instead).
Best guess by process of elimination is this one for the other one in the screen caps. It is the only one that has what looks like a skinny enough front shell. That is a weird one as it does not seem to exactly match any of them correctly unless it was re-Velcroed at some point. Look how much mid-plate is sticking out. (that ultra skinny is also in Turnabout Intruder and a bunch of the season 3 episodes)
X Alpha (Not Hero)
X Beta (Not Hero)
X Gamma (Front shell too thick)
X Delta (No Screws)
Epsilon (No Screws)
Zeta (Shells too think in the profile view)
Eta (Front shell way too thick)
Theta (Front shell too thick)
Iota DING DING DING!!!!!!!!!!!!!!
Kappa (Front shell way to thick)