Argonian head normal map edge seam

[Yakub]

Hi, I managed to bake a completely smooth normal map for argonian head (female)

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but I still have a problem with edge seams:

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How can I make these seams disappear, like vanilla normal maps do?

I am using Blender 2.79a, the Steam version.

 

Also, how can I make it match the shade of body normal map? Particulary from Fair Skin Complexion.