What differences do john and edward have?

John has a pointy right ear, a scar above his left eyebrow and one on his nose. Edward on the other hand, has a scar above his lip, his front teeth overlap slightly, a broader frame, is slightly taller and has a baby face.

Those are the physical differences used to tell them apart. However, if you're like me, you will notice that they have slightly different voices, although you may need to get to the obsessive stage to actually notice that! (I do believe that Edward's voice is a little bit higher)

Also if you're going in personalities, John is more talkative and hyper generally. Edward is cleverer than John and is normally in the background.