Is mung bean same as yellow split peas
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They're not the same -- they are two different types of seed. They cook in a similar amount of time, and you may be able to substitute one for the other in various soup recipes, but the end result will taste different.
Sometimes Westernized recipes for Indian food will use yellow split peas as a substitute for mung dal (split skinless mung beans) or chana dal (from chickpeas). Canadian soups with yellow splits are traditional there.