Yeah, my TV isn't big enough for that. It's also possible it's the actor so I wouldn't want to speculate too much on it until we find out for sure it's part of the show.
ETA: A quick google search and they appear to be the same color. I think it's just the way his eyes catch the lighting.
On an unrelated note, something I didn't realize until this episode. Eva Heissen, the person in charge of the brothel, said she was an immigrant. I hadn't really noticed an accent, but I looked up the actress. She's Franka Potente, who is German and was in Run, Lola Run and the girl in the Bourne Identity. I'm surprised they're not playing up her German-ness more.