Well, no. They can be used interchangeably. When someone’s referring to Compound Coins, they mean cTokens, and vice versa. cTokens are used to interact with the Compound protocol. So, when someone redeems, lends, borrows, or mints cryptocurrencies, they will do it using cTokens and a cToken, or a Compound Coin if you prefer, contract. Currently, there are two types of cTokens: CEther and CERc20.