Harry Potter Fans! Draco Malfoy question in SS and CoS! Help?

Question

Remember the scene where Draco is in Diagon Alley with his father and tells Ginny off? Look at his face and listen to his voice.

Now go to the scene where Ron and Harry drink a potion to become Crabbe and Goyle; and visit Malfoy.

DOESN'T HE LOOK LIKE A COMPLETELY DIFFERNT AGE? Like he's in first year again all of a sudden?

Harry and Ron sound and look the same throughout the whole movie.

Does anyone know why?

THANKS!!!

10 POINTS TO A THEORY OR ANSWER PREFERABLY!

Answer 1

i bet it is lighting

Answer 2

I agree, he does look different. Maybe the Polyjuice Potion scene was filmed before the Diagon Alley Scene, because filmmakers do that, even people who make TV shows do that. They'll film one scene that comes last in the movie first or something like that. Maybe that's it. Or the lighting could have been different, making him seem younger.