Actually, Gunga's image is the same photo, doctored
. . .
Just sayin'. . .
In the JPL photo, the contrast is not as high, and the colored background is not there to provide contrast. In Gunga's photo, which is the doctored photo, there appears to be a regular step formation, which is the product of pixilation in enlargemnt--that does not appear in the JPL photo.
Look at them again, and compare Gunga's photo to the JPL photo.