I think this is 11th generation, where the A14 and M1 are the same generation. I expect we will see a few other chips from this generation, perhaps a A14X for iPad Pros and a M1X for bigger laptops and iMacs.
The issue is with macos running on apple silicon. There was a thread today somewhere with docker mentioning that they are still working on support for example.
Sure, it's all Darwin, but userspace matters a lot - you can do lots of things on MacOS that you can't do on iOS (JIT, arbitrary web engines, assorted emulators, pop a root shell and load arbitrary kernel modules)
A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, M1