Compatibility between RBR50/RBS20 & 50 and new WIFI6 Orbi Mesh units

I have a set up with RBR50 and 4 satellites (1 X RBS50 + 3 x RBS20).  I was looking at the latest Wifi6 units and wondered if it is poissble to reuse any of my older devices or if they would all need to be replaced?  i.e. can you mix the new units with the older models?

many thanks

Jon