Not really, see reply by Kanopus above. To amplify, WebUpdater reads and displays the device model from GarminDevice.xml, but downloads the correct files consistent with the HWID (PartNumber).
From GarminDevice.xml of my 3790 converted to 3490 (note HWID is 1376):
<PartNumber>006-B1376-00</PartNumber>
<SoftwareVersion>750</SoftwareVersion>
<Description>nüvi 3790</Description>
From original 3790 (note HWID is 1101):
<PartNumber>006-B1101-00</PartNumber>
<SoftwareVersion>500</SoftwareVersion>
<Description>nüvi 3790</Description>