You need to go to Cups and modify the printer, after you install the print driver on the local system. To modify the printer, you will need root access.
http://localhost:631 Enter this in a web browser, on the host system. Select the printer in question, and modify the printer by selecting the new driver. No reason to delete the old printer. The old driver would only be over written if the file names are identical, you would get a warning the file(s) are being overwritten, and you would have to say that is O.K. before that would happen.
No reason to touch samba at all.