I'm surprised that they've opted for someone so much younger than Tom. But, even more so, I'm surprised that they've opted for someone so much TALLER than Tom! There's a good 10 inches between the two - 5'7" versus 6'5". The poster is going to look like Arnie and Danny DeVito in Twins!
Hollywood has been disguising actors' and actresses' relative heights for generations. Although it's true that one of the main ways they've done that was with selective casting.