This use of E numbers is probably causing more confusion than what it was designed to eliminate.

E-471 is the new label designation for Mono- and Diglycerides of fatty acids (glyceryl monostearate, glyceryl distearate)

While it is possible to obtain it from animal products, it is more economical to obtain it from plant fats such as coconut or corn oil. It is very doubtful you will ever find it made from pig fat as it would be expensive to extract. Since it is a significant component of vegetable oils you may see it listed as an ingredients of products made with vegetable oil.

However, since there is a chance it could be obtained from animals you will want to verify the source, before eating the product - Woodrowli.