1. There is no difference between the two. Longkou vermicelli is made of mung bean vermicelli. It is refined using traditional techniques and is the more famous type of mung bean vermicelli.
2. Longkou vermicelli is a specialty of Yantai City, Shandong Province. It has a history of more than 300 years. It was named Longkou vermicelli because it was sold through Longkou Port. Generally, only vermicelli processed from mung beans or peas can be called "Longkou vermicelli".