Custom 100% rough shader for substance painter

I was wondering if it is possible to get a custom shader that supports 100% rough materials that don't reflect light at all. Currently if the material is 100% rough in painter there is still light that is reflected. At work I use a custom viewer where the darker areas that are fully rough dont reflect light at all. I would love to have a this as a custom shader in substance 3d painter so that I know my model will look the same in both programs. Below I have attached 2 images comparing the shadowed areas inside a shoe. I also noticed that in painter the textures seem to be slightly less saturated? I have attached one more image comparing the base color in blender vs substance 3d painter.