I wouldn’t consider them duplicates unless the file on Qobuz is the actual same file on your drives. IF Roon sees them as the same album, it will group them together and put the other versions under the Versions tab in the album. Unless, you have the option to Show Hidden set to Yes.
I would be very cautious because deleting a local file from Roon, actually deletes the physical files.
Otherwise, if Roon does not think the local files are the same as Qobuz it will show them as a separate album. There are many reasons for this, mainly stemming from metadata on the local files.