Orbi RBS 850 Satellite with RBR 960

The Ethernet ports on my RBR 850 (Router) stopped working over the weekend, and despite many attempts (update firmware, factory reset), nothing has fixed them (wifi works for a while but eventually also fails).  I tried a different router which resolved the problem making me conclude my RBR 850 hardware has failed and a new router needed.

I decided to try the RBR 960 with one Satellite.  My question is if it is now confirmed that you can use RBS 850 Satellite with the 960 (I see that in another post)?

While I probably do not need the 2 extra satellites given the 960's greater range, I do require ethernet port access in the current locations of these 850 satellites. So can I use them with 960 for this purpose?

Or am I better off getting something like the EAX20 (as it allows me to turn off the radio and provides Ethernet ports)?  Trying to avoid additional spend if possible.

Thanks for the guidance.