1. Different shapes: Jiang Dou is straight, usually cylindrical or oval, while red beans are round, usually spherical or oblate.

2. Different colors: Jiang Dou is usually green or light green, while red beans are usually red or crimson.

3. Different nutrients: Jiang Dou and red beans are rich in nutrients such as protein, fat, carbohydrates, vitamins and minerals, but the specific content and proportion may be different.

4. Different taste: Jiang Dou has a hard taste and needs a long time to soften, while red beans have a soft taste and short cooking time.