With this Tool you can compare two SharePoint Lists. E.g. if you have a test Server and a live Server, you want to know if you created all your Fields with the correct type.

You can download this tool here.

Update:
Here is an example what you have to write in the fields:

http://sourcesite/web/subweb
listnumberone

http://sourcesite/web/anothersubweb
listnumbertwo