I was working on a case today and realized we do not have an easy way to compare two URLs, so I put a solution up on Deployer.
The client was having an issue where two Google Universal Analytics pixels were firing on page load. You can see this in the image:
My first reaction was to figure out what was the difference between the two URLs. To do this right click on each URL and Copy Link Address and then paste one on the Left side of the diff and one on the right side of the diff, then click Compare URLs.
gray: same in both left and right
pink: removed from left side of diff
green: added from right side of diff