I can’t give you a definite answer, unfortunately. Materials are complicated. There is no simple solution for this.
What I suggest is using the original and modifying it. The material graph may hold the answers, as well. It’s not just images stacked on each other, there’s something else here, I’d say.
You could try to seek out the modding community on Steam for Atomic Hearts, as well, and see what they think! This is going to be something they’d likely be able to help with as they’d be more familiar with the specifics of the title. 