1. Make sure View / Path Navigator is selected in the Path Finder menu.
2. In PathFinder, navigate to one of the folders you wish to compare. Make sure the Path Navigator reflects the selected folder.
3. Click on the "Bottom Drawer" icon in PF, or select View / Bottom Drawer from the menu. A terminal window should open.
4. After the dollar sign prompt, type:
diff<space>.<space> (replacing "<space>" with a single space).
5. Now click command-t to open a second tab. Navigate to the second folder you wish to compare, as in step 2 above.
6. You may now do one of two things:
a. right-click the Path Navigator and select Copy Path / UNIX from the pop-up menu. Right-click after your Unix command from step 4 and select Paste from the pop-up menu.
b. OR, click one level to the left of the folder in Path Navigator (the folder's parent) and click-and-drag the second folder you wish to compare from the results pane down to the Unix prompt.
7. The terminal window should now show:
diff<space>.<space><path to second folder>
8. Click return/enter to view the results.
9. You may click File / Save from the Path Finder menu to save the comparison results as a text file.
This seems like quite a bit of work, but it really isn't. Once you try it a couple of times, it becomes very easy with Path Finder. Tabs aren't required for the process, but make it easier when copying the paths or if you wish to redo some steps. You can also replace the dot in the Unix command with the path of the first folder, but this is unnecessary work.