Red leaf lettuce and romaine lettuce are two different vegetables.

1. Red leaf lettuce, also called red leaf lettuce, is a lettuce vegetable with red leaves. Its leaves are relatively soft, crisp in taste, have a certain sweetness, and are rich in nutrients. It is often used as an ingredient in salads, sandwiches, burgers and other foods.

2. Lettuce is a lettuce-type vegetable with green or yellow-green leaves. Its leaves are relatively hard, crisp in taste, and have a certain sweetness and bitterness, and are also rich in nutrients. Lettuce is often used in salads, burgers, wraps, and more.