This is rather irritating. I would immediately think of a Command T34 here (I am a UX designer btw).
Personally maybe adding a small dot above the tank in the icon could make more sense. Like they did with the 120mm mortar. But also this is imo not perfect solution.
Btw I also think that from a visual and UX point of view, giving the 76 the barrels back was not a good idea. It is hard to impossible to differentiate the 76 and 85 tanks for new players. Suddenly a T34 appears and they wonder why it punches down a P4.
Clicking the unit as Katitof mentioned is also no way to go here. In the heat of a battle where you have to place your units and move them around, it is simply too much for a "noob" to also check if the approaching tanks are "easy" or "hard" to break.