The config entries you seek are in the Bin folder of the game root, in a file called config.bin.
Nearly everything in the game has its config entries in there, the exceptions being the addons in the Addons folder.
The east and resistance versions of these tanks use the same models, the difference for resistance is the addition of a green stripe to the model using a hidden selection in the model (pruh).
If you change the T72 and T80 models (keeping the same model names) then the resistance versions will also use the same models, but, chances are your replacement models will not have the 'green stripe' hidden selection and consequently they will look the same as the east tanks.
Planck