Find where a widget is used

Is there to find all locations within the site that a specific widget is used?

Example 1: I have an out of the box widget and I want to replace it with a custom widget throughout the site. I'd like to be able to locate all the out of the box widgets to replace with the custom widget, and not have to spend hours going through each group on the site to locate the widget to replace it. 

Example 2: Locate all widgets that are custom and no longer in use-- mark them as Defunked so they are not used again or needed for an upgrade.