It may be of some use to understand the source of the terms. One source indicates thus: "The etymological idea underlying the word soup is that of soaking. It goes back to an unrecorded post-classical Latin verb suppare soak', which was borrowed from the same prehistoric German root (sup-) as produced in English sup and supper. From it was derived the noun suppa, which passed into Old French as soupe. This meant both piece of bread soaked in liquid' and, by extension, broth poured onto bread.' It was the latter strand of the meaning that entered English in the seventeenth century. Until the arrival of the term soup, such food had been termed broth or pottage..."
Long winded way of saying they're really, the same...