1, different varieties. Broccoli is a kind of western lettuce, that is, a variety introduced to China from the western region, which is regarded as one of the lettuce. While lettuce is mostly native to China.

2. The leaves are different. The leaves of lettuce are wrapped around each other. Lettuce leaves extend outward, and there will be many folds on the surface of the leaves.

3. Different shapes. Round lettuce tends to be spherical, and the shape of lettuce is irregular.