I believe there are some differences in the chassis of the new 8x8 compared to ZBL-08. First is the Rear ramp. Second would be the armor.
The third is the shaping of the hull, especially around the wheel well. Fourth, the engine is located in the front beside the driver location and has a slightly modified arrangement. The change is most visible for the assault gun version. ZBL-08 one has the engine at the rear, while the new one seems to put the turret in the same 8x8 chassis as the new IFV, so it still has an engine at the front and ramp at the rear.
No, ZBL-08 has the engine at the front, because it's the IFV variant of the Type-08 family. The only variant of the Type-08 family that has rear-mounted engine is the ZTL-11 assault gun.