There is no difference. Soda biscuit is a kind of carded biscuit. There is no difference between Taiping carded biscuit and soda biscuit. Soda biscuit is a kind of fermented biscuit. It has only two flavors, salty and sweet, and its taste is crisp. Square or rectangular products are common in the market. The "soda" in soda biscuits is the transliteration of "soda", and some people translate it into "carding".