Customize - Keys - Conflicts may look as follows:
The toolbar name is listed but not the path of buttons resulting in the conflict.
The problem is you can't tell which button in the toolbar you are deselecting or editing. As a result, you need to go to the toolbar and hunt around for the conflicting buttons.
In the screenshot, the first full path is:
toolbar "-Menu JEG" - button "Toolbars" - button "Favorites Bar"
The second one is:
toolbar "-Menu JEG" - button "Panes" - button "Favorites Bar"
I suggest including the full button path in Customize - Keys - Conflicts in the Location column.