The challenge claims there is only one difference, but a careful comparison suggests there may actually be two.
First, compare the cargo pockets on the shorts. One pocket appears slightly larger than the corresponding pocket in the other picture.
Next, look closely at the hands. The thumb on the figure on the right is positioned farther outward and appears more open.
That means the puzzle may contain an unintended extra difference.
Answer: The pocket size and the more open thumb on the right are different.
