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I emailed Bakflip, to find out if the Mx4 I have on my 2017 will fit on a 2021 Raptor bed and they said no.
They told me I would need to purchase a new one. They didn’t say why. Might be because they want me to buy another cover? Not sure?
It looks like it's the same product for 2020 and 2021 on their website, although can't 100% confirm since I don't see model numbers. If it were me, take the cover off your old truck and see if it fits on the new. It's not like you need to order the new cover first.