I don't have any good info on the present state.
Some say that Capture One can process DNG files from Leica S or Pentax 645Z. Not supported is grey zone. But not supported means no colour profiles.
Capture One's support for DNG used to be ice cold but may now be lukewarm, but don't assume a complete DNG compliant processing pipeline. I would guess that Capture One uses the raw data from DNG but not the colour conversion tables.
Neglected to mention my 645Z files are currently in DNG format.