I'll take a shot at answering this and add some comments on the figures, which I like a lot and already ordered.
These 4 commanders are officers.
In the Heer the crusher cap ( 1,3 and 4th figures) is an officer's item (in the SS it was an officer and an NCO item. but of course never say never!) The second figure has the officer's silver edge on the sidecap. The buckle on the first commander looks to me as an EM buckle, while the others are open, two pronged belt buckles used by officers.
Not sure of the shoulderboards, but might need to touch them up with some silver paint as they seem to be black, EM shoulderboards.
The first figure is wearing a black kombi over the regular black panzer uniform. The kombi has the breast eagle, but the other three commanders are as far as I can see missing their breast eagles.
All 4 figures have the pink piping on the tunic's color, which is fine for officers, but no piping would also work well and be more at home in late war scenarios (which the dark yellow binoculars indicate, together with the PzIII w/sideskirts which is a 1943+ vehicle. In the Heer panzer uniform the shoulderboards would be the same for all ranks, so these are perfect.
Hopefully we will see SS tank commanders. Here it is a bit more complicated as the left collar tab has the rank and the right the runes. Of course the hat insignia is diffeent too. Most SS crushers had white piping, regardless of branch. Not impossible to have non white, but it would be rare.
Can't ever have too many tank commanders. Maybe have some variations with sidecaps and M43 caps.