Yes, you really are looking at two Thors.
On the right, is actor Chris Hemsworth, who plays Thor in all the movies. On the left, is Chris' stunt double, Bobby Holland Hanton.
Bobby's been Chris' stunt double for over five years. He seems to genuinely enjoy working with Chris, who he says has the same kind of personality that he does, so they laugh at the same things.
Bobby also says Chris is very generous, and buys Bobby watches as a way to say thank you.
He does say that the gig can be tough, though, in that Bobby has to be in the same shape Chris is in so it takes a lot of training and eating right.