My uncle told me a story about a crew using the wrong mortar mix for brick veneer on a whole house side. They had to chip it all off and start over, a total waste of two weeks. That's why his rule is to physically open the bag and read the type code before it ever touches water. You can't just trust the label on the pallet because sometimes bags get moved around. It seems like overkill until you see how expensive a simple mix-up can get.