True PBS textures have no lighting information baked into them. That’s about it. You can use diffuse maps but they are different than albedo. Some people say they’re the same but in reality they’re slightly different. Albedo has no lighting information in it (like shadows) while a diffuse may have some. Read this article, it’ll give you a much more in depth understanding: http://artisaverb.info/PBT.html
