The products of plant fermentation and animal fermentation are different because they involve different types of microorganisms and substrates.
Plant fermentation is the process by which microorganisms break down plant material into simpler compounds. The products of plant fermentation can include organic acids, alcohols, gases like carbon dioxide and hydrogen, and other compounds like vitamins and enzymes. Examples of plant fermentation products include sauerkraut, kimchi, yogurt, and sourdough bread.
Animal fermentation is the process by which microorganisms break down carbohydrates in the digestive tracts of animals. The products of animal fermentation can include volatile fatty acids, gases like methane and carbon dioxide, and other compounds like vitamins and amino acids. Examples of animal fermentation products include cheese, yogurt, and kefir.