I’m having trouble multipass comp scenes containing the alShader. Looks a bit like the sss from the alShader contains to much of the GI and Lighting pass. Does any one have a solution for this?
Here’s a link to a rendered frame. Unique Download Link | WeTransfer
Basic Nuke script
WeTransfer
comp.rar (3.31 KB)
Definitely something strange going on there.
It looks like the GI is added into the SSS fully?
I tried subtracting the GI from your SSS, and used that result as the new SSS when you combined your passes, and now the skin is matching.
So perhaps that can be your workaround until it has been fixed.
And Hi from Gothenburg 
Small world