Jerk Sauce and Jerk Seasoning have very similar flavor profiles, but they are used in different situations. Jerk Sauce is a wet marinade made using soy sauce, water, etc. This is great for if you need to soak meat or vegetables in a liquid marinade before cooking.  Jerk Seasoning is a dry rub blend that is made using dry spices. This is best for sprinkling on meat or vegetables before cooking.