Hasbro has updated the paint application on The Black Series Imperial Death Trooper figure. The newer application looks much cleaner on the helmet and they have changed the vent colors from a gray to a dark charcoal color. Also the green circles at the base of the Helmet have been omitted as well for some reason. The newer figures were packed in the The Black Series 6" Wave 6 case (which includes Baze Malbus).
• 1st (DS 62231): Gray painted vents - green circles.
• 2nd (DS 63131): Dark Charcoal painted vents - No green circles.
I have included a comparison photo above. Old version on the left and newer on the right.