very generally speaking
cinnamon = brown
black pastel = black
Unless you want to argue that lemon pastels are different morph from other types of pastel. They are different lines, lesser originated from RDR and I don't know where butter came from, but its just like the different lines of pastel.
Every year as more lessers and butters are bred. The difference is blending in each direction making it pretty obvious the blushing and yellow is not just the lesser/butter gene but also one or more of the other thousands of genes we can't identify. Butters can look like lessers now and lessers can look like butters. same morph.