Aside from all the differences, the new iPad Air seems to have a backlight bleed problem that the 2020 Pro doesn't have. I went to the Apple Store to get a replacement and the replacement device had a backlight issue that was worse than my current one. So I swapped it out for a 11" Pro and they let me keep the 20W charger with the Air.
yes, my new Air is the first in a long time with backlight bleed. None of the several Pros before had it.