Not exactly. Salade Nicoise contains tuna (or anchovies) and hard-boiled eggs, which are just two of many other ingredients, including olives, green beans, and potatoes dressed in a vinaigrette. While it does contain egg and tuna, and perhaps some similar seasoning, that's where it ends. In an egg salad with tuna, the two proteins come together to create one entity. They are the salad, not just a part of it!