When I changed out a vip622 for a hopper/joey the 622 codes worked with no changes required. As stated above, the Hopper defaults to RF only. One word of warning - occaisionally Dish pushes an update to the Hopper that resets it to RF only - you'll need to have the Dish remote available to turn the Hopper IR back on.

Another note - the hopper and joey only allow a single IR code set - you can't set each receiver to a different IR code set as you used to be able to do with the earlier receivers. If your URC remote was programmed to use Dish IR codesets 2 or higher you'll have to reprogram using the Dish codes for the default codeset.