PSA : You can still use Compare Tool on Muthead (with pictures)

Not sure why, but it's not working by clicking the plus sign.

However, you can make it work by adding the player code at the end of the URL by doing this:

First click compare on the card you want to compare on the player page

Then you'll get to the page where you "cant" compare and the URL will look like:  http://www.muthead.com/madden-mobile/18/players/compare/XXXXXX (XXXXXX is the 6 digit player code)

Open another tab and find the player you want to find that player's code (YYYYYY).

Then just add a forward-slash and add the player code: http://www.muthead.com/madden-mobile/18/players/compare/XXXXXX/YYYYYY