Xiaomi's Director of Product Marketing, Zhi Zhiyuan, has confirmed that the company has no plans of releasing an Mi Max 3 Pro. Previous word claimed that the Pro variant of the newly launched Mi Max 3 would be powered by a Snapdragon 710.
https://www.notebookcheck.net/The-Snapdragon-710-powered-Mi-Max-3-Pro-is-dead-in-the-water-Xiaomi-executive-confirms.318588.0.html