They both seem to be different tank turrets, guns, and chassis. Or at least heavily modified versions of the same. Notice how the roadwheels don't look the same on both vehicles or how the fume extractor isn't in the same position. One also seems to have more modular armor packages than the other. The driver position in the hull seems different. In one tank it's in the middle, and in the other tank I think it's in the right of the chassis.
I think those pictures show three tanks. Two are Type 96 derived and the other is some variation of the VT-5 tank.
The Type 96 derived tanks seem to be the VT-4 in the picture above (left) and the VT-2 in the picture below (right).