Adding an Orbi WiFi 6 Satellite to an existing RBR50 mesh w/3 RBS50 add-on satellites

Hi all,

I have an existing mesh system consisting of the RBR50 router and 3 RBS50 satellites using a star connection.  I want to add another satellite.  Can I add the newer WiFi 6 mesh satellite to the older RBR50 router?  I know I won't get faster WiFi 6 speeds, but in the future when I upgrade the router and other satellites to Wifi 6, at least it's 1 less satellite I have to buy.

Thanks,

Lance