These are minor differences in all Nations, from one part of that country to another!!, just have to look at the Southern and Northern States of the USA, and even in a small Island like the UK, between the North and the South....
The differences are not ''vast'' there subtle in many ways, but also distinct in China, but mainly to the Chinese themselves. ...just like everywhere else really!!!
Now if your talking about differences between rural populations and city dwellers in China, sure there are differences, but that would go for Southern or Northern rural populations compared with any city dwellers, ....North or South!!!
David.....