Oliver Phelps (George Weasley)
His eyes are a bit more slanted, and not as deep. His eyes slant down towards the outside corners a lot more than James' do. He is also fabulous at winking. He has a bump to his nose, whereas James doesn't.
How do you tell which one is Fred and George apart?
Fred has a more round face, his features not as defined as George's. On George's face, you can clearly see his cheekbones and in a way, George's face is 'skinnier' looking. Fred's facial features are less defined than George's. Second, the way their hair is styled.
Which twin is which in Goblet of Fire?
Oliver Phelps, who portrayed George Weasley (one half of the Weasley twin duo Fred and George) across all eight films, explains that a stunt during Harry Potter and the Goblet of Fire turned out to be trickier than anticipated.