When looking to compare track(s) or album(s), it's best to start with just 1 track in the main view.
First select the track you want to use as the base track.
Click expand on the widget to allow for multiple overlays:
Next select the Artist, Content Type (Album or Track) and Title and click Apply Filters.
This adds the newly select information to the chart for you to compare:
Note: You can add as many different filter combinations as you'd like.