there is apparently one more undocumented change (discovered thanks to the guys from Tank Inspector team) – Chinese Chi-Ha was changed. The visual model was slightly changed and the turret frontal armor (for both turrets) buffed from 25mm to 35mm. The gun armor was also slightly changed.
The “red” one is old, the “orange” one is new (hull thickness remains the same, but the color red is now used for the 35mm zone). Notice the suspension details.