> But in theory the RAW converter has been profiled for each specific camera using ICC color targets and stuff like that.

In practice too, if consistent results are desired. The format being identical doesn't mean the values the sensor captures under the same conditions will be identical, so a color-calibrated workflow could produce wrong results.

It would be nice to have a setting for "treat camera Y like camera X (here there be dragons)" though. I've had to do something similar with the Lensfun database to get lens corrections working on Mk. II of a lens where Mk. I was supported, but a GUI would be nice. A prompt to guess the substitution automatically would be even nicer.