The angle and position of the left hand and arm are completely different in each picture.
Interestingly, and even allowing for different angles of the wrists, in the first picture the hands and wrists appear to be rather different in size, which is not explained by proximity to the lens and depth of field as they’re both about the same distance from a fairly standard focal length lens.
In addition to the trouser legs being identical as pointed out by flamethrowerguy, the bottom of the jacket in the second picture appears below the camo jacket in the first picture at the top of his left thigh.
Be interesting to see what’s missing from the bottom left corner in the second picture. Note that the first bloke doesn’t have an index finger, or maybe a little finger, and there is no index finger shown in the second picture. The finger ends in the first picture look a bit odd, which could have been achieved by photoshopping out the curled ends in the second picture. The thumb in the first picture looks unnatural and is straight where the second one is bent.
The second one looks genuine and seems more likely to be the basis for the first one.
But why would anyone go to all that trouble? Maybe the publisher just lacked a suitable photo for the first image and doctored the second one? What’s the caption in each book?