As long as the screenshots can be distinguished and differentiated, you pretty much have your work cut out for you. Now it's just doing the work that's time consuming. What main categories are you going to take a look at out of curiosity?
I don't really think the ones up there now are photoshoped but... the main categories I'll be analyzing even more than the others are Overall damage done, Damage per second, Overall protection, Protection per single life, Overall healing, and healing per second. The main reason for this is because these categories are the ones that factor into the server comparison section.