These are two different species of cabbage (Genus Brassica). Regular cabbage is generally green, and red cabbage is reddish or purpleish, depending on the pH of the soil in which it was grown.
Red Cabbage and normal cabbage are two different cultivars of the species Brassica oleracea. The main difference is that red cabbage produces a lot more of a pigment called anthocyanin [citation 1] a class of natural pigments that make plants purple or red than normal cabbage.
Brassica oleracea actually gives us many vegetables that we usually think of as separate species: Kale, broccoli, cauliflower, brussels sprouts, kohlrabi are all actually one species because they were all domesticated from the same species of wild mustard plant, and can still breed with each other. [citation 2]
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