Off topic real quick but I heard rumors of China making a new heavy attack helicopter? Would that fit the role better than the Z-10?The difference is armour weight. The Z10 has armour, while the Z19 probably has no or minimal armour.
This can be seen in the lack of a gun for the Z19, because it’s not suppose to get close enough to the action to be able to use one.
The Z19 is your typical light scout and attack helicopter designed to be fast and agile and take shots of opportunity from long range and run.
The Z10 is supposed to be able to stay on station to press home the attack and support ground forces. It doesn’t have the heavy armour of the likes of the AH64 or Ka50 or Mi28, but it’s armour should be able to stand up to common infantry calibers at a minimum, and may even be able to take a few hits of heavier weapons like 50 cal or 14.7. But it won’t be able to withstand 20 or 30mm hits like the heavy attack helicopters could.