https://wccftech.com/a12z-bionic-similarities-a12x-bionic-extra-gpu-core/

We’ve been speculating in our previous reports as to why Apple would choose a name variation of the latest chipset fueling its 2020 iPad Pro lineup. After all, the A12Z Bionic is a new silicon right, since it sports that that new letter ‘Z’? Turns out, it happens to be a renamed version of the A12X Bionic that is running in the 2018 iPad Pro series.

With previous AnTuTu and Geekbench scores for both the A12Z Bionic and A12X Bionic turning out to be almost identical, it would beg the question if Apple decided to just end up changing one letter from the chipset and calling it a day? According to Apple’s webpage for the 2020 iPad Pro, the following description has been provided for the A12Z Bionic.