You can compare the properties of two non-file items or different revisions of the same item.
Select the two non-file type items whose properties you want to compare, such as two change requests in the
Upper pane, or select two revisions of the same change request in the
History pane.
Choose
Tools
> Compare from the main menu.
This opens the embedded compare panes at the bottom of the windows, and displays the properties of the two selected items.
You can only view the properties here. You cannot change the properties.