The Device Viewer also has a Config Explorer page (Device Viewer –> Configuration Management –> Config Explorer) that allows you to compare any saved revisions of a single device's running or archived configuration files.
Do the following to compare two configuration files in the Device Viewer:
For a specific device, go to Device Viewer –> Configuration Management –> Config Explorer. Select two files in the table by checking their boxes.
Select Compare from the drop-down menu. The Comparing Configuration Files window appears, and you may begin comparing the files.