In fact, they are one and the same. In other words, you can make split peas with green or yellow peas. Both kinds come from the seeds Pisum Sativum.   The difference between split peas and green peas is the way the peas are processed.   To make a split pea, the green pea is peeled and dried. The skin is removed, and a natural division occurs in the cotyledon. The latter can be further exaggerated manually or mechanically.