The Similar Assets report will compare the differences between assets in the same Org. This is useful for finding redundant assets that can be deleted or cleaned up. For example, if you want to know if you've got similar Profiles for the purpose of cleanup, this report will tell you all you need to know. Right-click on your Snapshot icon and under the Document option, click Similar Assets.
You can select a Metadata type from the left column to view immediately on the righthand side. Once all of the metadata has loaded you can scroll throughout the interface to see how similar each asset is to the next. We break it out diagonally, so you'll see the 100% matching going down to the right. If you want to learn more about particular assets, you can pull down from the lines in at the top of this view to see the XML comparisons.
If you'd like to compare more than one Metadata type, you can check the box next to any/all the types you'd like and then click Next, or the Display Report tab at the top.