I've heard that some people are actually able to tell the difference between the Phelps twins.

So...

In the scene wherein the fat lady guarding the common room of Gryffindor got stripped off and sent to another painting, basically all of them were gathering around it right? Yeah, that scene.

So, who was the one in the light colored polo and who was the one in the dark colored polo? [among the Weasley twins, I mean]

^^