Klaatu Skiff Guard is known with unpainted and with a black painted hood. The numbers of the unpainted hoods are quite to high for being a factory error, so I would call this one a legit variant.
Both hood versions can be found with different shades to the brown paint on torso and legs. Presented here, are two quite different shades to the front. The figure to the right has a different painted back part of the torso which is from a different stash and got mixed up in factory.