Timing would be key. If you have ordered the new iPP will it arrive in the return window for the 2020 MKB? Or just go ahead and buy the keyboard and watch for reviews which should be appearing in the next week or so that will probably mention whether they will work properly. If for some reason a reviewer says it does not then return the purchase if you still have that option.Is it even worth considering getting a 2020 MKB that is now reduced to clear for a 2021 12.9 iPad Pro?
There’s really no clear indication that it won’t work. I think if I didn’t already have mine I would go for one of the discounted ones.