In Australia I worked for a brief period with a motorcycle dealer.
They had fitted plates to two black motorcycles, but got them mixed up. They discovered the error a few days later when the warranty information was being entered in the computer. To correct this error with the authorities would have beed a nightmare so they called the customers and told them there had been a minor recall to update the ECU and gave them appointments for the same day. The workshop was closed to the public and two mechanics stripped and remounted all the parts on the correct frame and engine assemblies. Both bikes had hardly been used so they were not concerned regarding mechanical components. In reality the only real difference was a small difference in the odometer reading for kilometres traved. The job was done in about 6 hours and later both owners commented that their bikes ran much better after the "update".