No, not exactly, but they can be used interchangeably in this recipe. While they are both cured ham products and prepared in a similar way, they have different flavor profiles. Serrano ham is a Spanish product, while prosciutto is made in Italy. If you want to try Serrano ham in this Spanish-influenced croquette recipe, you can order a full bone-in Serrano ham online! This would make an excellent gift for food lovers! If the full ham is too much, you can also buy a small portion of sliced ham imported from Spain.