At 14 weeks those combs and wattles are very red. My RIR girls are 16 weeks and their combs and wattles are not that red. I was led to believe that a hens comb and wattle goes red right before they start to lay. That being said the body structure and posture are not screaming roo to me. I...
It's hard to tell from the photo, but a Cucko Maran will have gray colored legs. Either way the lighter one is a roo. In both the BRs and CMs the lighter is the Roo. Seeing these two side-by-side, along with the comb and wattles and crowing. Slam Dunk ... Roo.
My gut tells me it's photoshop. A quick google search only showed this one picture of a "blue" comb. There are several references to poor circulation or frostbite causing a blue or purple hue to the comb, but the don't mention a completely blue comb.
4 weeks is kinda young to get an accurate assessment of the gender for these chicks. Give it another month or so and you will have all the opinions you want :)
I am very new at the Maran breed, so I recommend PM-ing someone like Donrae. She is very knowledgable about the Marans and BRs. If I were to hazard a guess it would be a BR. This guess is based upon the eye color and leg color. I have two Cuckoo Marans and they both have a gray color legs...