As we reported exclusively, the iPad Pro (2020) is fitted with a rebinned A12X chip that it has simply renamed the A12Z. The confirmation comes after TechInsight carried out an x-ray of the A12Z highlighying it has exactly the same physical layout as the A12X.
https://www.notebookcheck.net/TechInsights-confirms-our-analysis-that-the-A12Z-in-the-new-iPad-Pro-is-just-an-A12X-with-an-extra-GPU-core-enabled.461626.0.html