The transmaps need to be excluded from GC in the material room: "Custom Gamma Value = 1.0"

Rule of thumb: Colored maps = 2.2. B/W maps = 1.0

SceneFixer snd EZSkin will usually do that automatically, but some hair shaders are a bit weird so you have to do it manually.

Other than that, the skin shader looks much, much more realistic on the GC render. Eye shader could use some more tweaking. The eye-shader EZSkin creates doesn't look good with any eye-texture.