No, technically the two are not the same. There is a difference in the ingredients used in the two types of salts. Traditionally, these salts should contain an active ingredient called magnesium sulphate, and if they contain only this type of magnesium, they may be called Epsom salt. True Epsom salts don’t have any other added ingredients. If these salts have other elements in their composition, they should not be called Epsom salt.