As has been explained already, they don't play in the same position. Playing out on the left of a flat midfield four in a 4-4-2 isn't the same as playing wide right in the formations we've been using for almost all of Walcott's career here. Walcott is 100% a forward, Pires was categorically not a forward.
I don't want to get bogged down in semantics like people have been with Sanchez, but Walcott and Pires do/did play in different positions.
And as I've said, you act very trollishly quite often, you can't then get indignant when people dismiss you when you're trying to be serious. Be less of a troll and people won't dismiss you as being a troll.