This is Shawn and Aaron Ashmore.
We'll start with Shawn Ashmore.
Shawn got his big break on "Animorphs."
He went on to play Iceman in the X-Men series.
He now stars as Agent Weston on "The Following."
Then there's Aaron Ashmore.
Aaron played Troy Vandergraff on "Veronica Mars."
Then he joined the cast of "Smallville" as Jimmy Olsen.
Most recently, he's played Steve Jinks in "Warehouse 13."
So there you have it. Two very different actors who happen to look identical.