Pork ribs: Wild variation?

semiautomagic

I am attempting to estimate an accurate count for a full slab of ribs from my favorite rib joint. When searching for "full slab ribs" on the mobile app, i get wild variation in the amount of calories, anywhere from 1895 to 895. Does anyone know what variables increase the amount of calories in ribs? Is it mostly the sauce, the size, or the type of meat? Thanks in advance.