It's different. Generally speaking, fresh potatoes are rich in B vitamins such as vitamin B 1, B2, B6 and pantothenic acid, as well as a lot of high-quality cellulose, as well as trace elements, amino acids, protein, fat and high-quality starch. Yam contains a variety of amino acids and glycoproteins, carotene, vitamin C, vitamin B2, amylase and so on.