answer:The same. Purple potatoes are very similar to the popular Russet potatoes in nutritional value. One-half cup of purple potatoes contains 70 calories, 15 grams of carbohydrates, 1 gram of fiber, 2 grams of protein and no fat. All colorful potatoes provide carotenoids (and some also provide flavonoids) that white potatoes do not. Carotenoids and flavonoids are pigments, and according to nutritional research, they provide us with many health benefits, including cancer protection. Technically, you’ll get more fiber and minerals per bite from smaller potatoes of any kind, since they have more surface area (skin) per amount of starchy inside (total volume).