the ipad pro is able to run the m1 chip, but the m1 pro/max will run much hotter due to more cores. with CPU at ~70% increase and GPU at 3-4x increase, the thin design of the ipad will not physically allow it to run the faster chips. as a matter of fact, the ipad pro isn't even able to run the m1 at it's full potential. perhaps if the m2 chip uses smaller nm process, with maybe 25% increase in performance over the m1, the ipad can run that.
Apple knows this. Their margin on MBP is probably higher than Mac Mini and they probably don't want the work-from-home crowd's growing interest in Mac Minis cannibalizing what would have otherwise been MBP purchases