I've been looking at the hair shader. What I found is there are 2 issues. The first issue is that the bun base is partly transparent and you're seeing the background through it.

Here is the original in from of a light light background and one close to the color of the hair.

In the next 2, I removed the transparency. It's much closer to the color of the hair

These are much closer, but not exact. That's because of the specular map giving it baked-in highlights. Remove the and the hair matches.

If you use Firefly, the bun looks fine. The shader isn't compatible with Superfly. With a proper Superfly shader, it looks decent. This is ghostships hair shader.

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