Mac Address Changer
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You can modify the printer ip address via the CUPS admin page, but you will have to do this on each client.
Open your browser and type http://127.0.0.1:631/printers. You will see a page with each printer queue listed. For the printer/s you need to change, click on Modify Printer. You will have to authenticate as an administrator of the Mac (which I guess you are). Click Continue until you get to the Device URI page where you can change the ip address. Click Continue until you get back to the Printers page.
FYI - Can I suggest that you look using DNS names for the printers rather than IP addresses. That way if there is ever a need to change the address on your printers, you will never need to change the driver on the client...
Open your browser and type http://127.0.0.1:631/printers. You will see a page with each printer queue listed. For the printer/s you need to change, click on Modify Printer. You will have to authenticate as an administrator of the Mac (which I guess you are). Click Continue until you get to the Device URI page where you can change the ip address. Click Continue until you get back to the Printers page.
FYI - Can I suggest that you look using DNS names for the printers rather than IP addresses. That way if there is ever a need to change the address on your printers, you will never need to change the driver on the client...