Enchilada sauce can be compared to hot sauce. It's usually mostly liquid with a few, random chunks of chilis. Canned enchilada sauce comes in mild and spicy options. Although enchilada sauce can be used to make enchiladas, it should not be substituted for tomatillo salsa or salsa verde when making chili Verde.  Salsa Verde (or green salsa) is made with tomatillos, chilis, garlic, onion, and spices. It is more chunky than enchilada sauce and can be served with corn chips like most salsas.  It can also be used as the simmering sauce for pork, as a short-cut to making your own tomatillo salsa to use in chili Verde.