Since SARS-CoV-2 is a recent "human coronavirus", its ability to mutate relative to the "common cold" varieties is not yet clear.
This mutation is likely the result of errors in the proof-reading of RNA polymerase. It would seem that the new coronavirus would have to have a similar inherent mutation rate equal to those of these common viruses. Genome studies* suggest the mutation rate with the new virus is substantially lower than those of the flu virus. There is no reason to believe it will be just the same as all other coronaviruses in humans until that is demonstrated.