Milnot is a brand name for 3 different products: Sweetened Condensed Milk Non-Fat Evaporated Milk "regular" Evaporated Milk
If the recipe only calls for "Milnot", it's missing some information. I would base my decision on which product to use based on what the recipe is for. In other words, if it's a savory dish, like a meat gravy or macaroni and cheese type of thing, use one of the evaporated milks. If it's dessert, use sweetened condensed.