If you installed both from scratch using the sdcard install(ie you didn’t clone the SD card) then you may be running into a rare issue where roon assigns them both the same id.
I ran into this a few years back - and have read a small number of cases here.
If I recall the solution was to disable both endpoints in roon, completely rebuild both Ropiee endpoints and then reconnect.
My experience is here https://community.roonlabs.com/t/strange-zone-identity-issue/