Yeah, the differences in the screenshots for the atmosphere are easily explained. In the read me I mentioned having a different set up when I posted the results in the original thread but since switched to a variation of an atmosphere set up that JBaldwin posted a very long time ago. So the fresnel power/boost, etc don’t exist in the material that I provided.
As for the noise remapping, I wouldn’t know since I have yet to upgrade past 4.12, sorry. However, everything should/will still work with the revamped noise nodes as it’s just providing color information to the black and white values.