Difference between the Hi12

I am wondering, what are the big differences between all the Hi12, that you need to be careful of which version or serial number your tablet/convertible has.
I have the one with 4517010xxxx and it has the Intel Z8350 CPU. But I also have the Hi10pro, which also has the same cpu and came also with the Z8300 cpu.

So I can see, that at some point the Hi12 got a new touchscreen, besides the Z8350 cpu.
What else?