Major difference!
the ZX is prone to under steer, and the front likes to slide out before the rear. going with a larger diameter front tire does change the geometry but that change seems to be made up for by more surface area on the road. More tire on the road always means better traction. Plus the Diaballo has a nice round profile compared to many other brands so the rear tire to front is a non issue
If you do go w/ some other brand, and the larger front just make sure the side wall step or shoulder is close enough to the rim to never be an issue. I went 110 70- 120 70- and finally 130 70- in the front, and the 130 is the best of the bunch. Looks pretty bad ass too. More purpose built looking instead of a GP bike wanna bee