Why would you want to do this?
Which iPad Pro model do you have?
The 12.9 and 10.5 inch screen iPad Pro models have much better hardware features/specs than the 2018, 6th gen iPad.
The current iPad Pro models support the Apple Pencil, have better screen technology, better cameras and better audio system, as well as, 4 GBs of RAM.
Even the older 9.7 inch screen iPad Pro has better screen technology, better cameras and better audio system, supports the Apple Pencil, too, but has the same 2 GBs of RAM as the new 2018, 6th gen iPad.
2018, 6th gen iPad is Apple’s entry level iPad with older, non-laminated screen, two speaker audio with only 2 GBs of RAM.