The terms “red snap” and “purple snap” are not commonly used terms in any specific context, so it’s difficult to provide a clear answer without further information. However, assuming that you’re referring to certain types of vegetables, such as snap beans or snap peas, I can provide some general information on the differences between the two.

Snap beans, also known as green beans or string beans, are a common vegetable that are available in many different varieties. While there are some types of beans that are red or purple in color, the most common variety of snap beans are green. However, snap beans can also be yellow, purple, or a combination of colors.
In terms of flavor, there is not a significant difference between the different colors of snap beans. However, the texture and appearance may vary slightly. For example, purple snap beans may have a slightly tougher skin than green snap beans, and may take longer to cook. Yellow snap beans may be sweeter and more tender than green snap beans.
Snap peas, also known as sugar snap peas, are a type of edible pod pea that are often eaten raw or lightly cooked. Like snap beans, there are many different varieties of snap peas, including some that are purple or red in color. The most common variety of snap peas, however, are green.
In terms of flavor, snap peas are generally sweeter and more tender than snap beans. The pods of snap peas are also more delicate than snap beans, and may require less cooking time. However, like snap beans, the texture and appearance of different colors of snap peas may vary slightly.
Overall, the differences between red and purple snap beans or snap peas are relatively minor in terms of flavor and nutrition. However, the different colors may offer some variety in terms of texture and appearance, and may be a fun way to add some color to your plate.