Hartley played superhero Oliver Queen / Green Arrow in Smallville, the role Amell will take on in the new CW drama.
“[Stephen] doesn’t need any tips from me,” Hartley told TVLine. “I wouldn’t even begin to do that… He’s going to be great.”
Amell himself also insisted that he and Hartley are “buddies”, but insisted that Arrow will be very different to Smallville.
“People will realize within five minutes of watching the [Arrow] pilot that, other than in name, the characters don’t have anything in common,” said the former Vampire Diaries actor.
“They’re both in DC [Comics] universes, but those universes are very, very different,” he added.
“[Arrow is] sort of like [The Dark Knight director] Chris Nolan’s DC universe, where nobody has superpowers, while in Smallville a lot of people had powers. That’s a fundamental difference.”
Arrow will debut on The CW this fall, paired with Supernatural on Wednesday nights.