Open CPS. Open your saved code plug. Read the unprogrammed radio. Both will open in the same session of CPS. Click the WINDOW menu up top then select TILE. This is the easiest way to view both code plugs. I also close the help pane.
Highlight the channels you want, right click and select COPY. Go to the unprogrammed radios window, put your mouse over the matching tree item, right click and select PASTE.
You can COPY and PASTE pretty much anything between XPR models (buttons, General Settings, Contacts, Talk Groups, Channels, etc
You cannot copy and paste scan lists or roam lists. Other than that, I find the Mototrbo software to be the best one Motorola makes as far as ease of copying between model numbers.