Any collagen contains peptides, otherwise it would be gelatin (also known as isinglass).

Collagen is actually produced by hydrolyzing gelatin in other words, by breaking it down into peptides. Peptides are small chains of amino acids. Through digestion, our body also breaks down proteins into individual amino acids or small peptides in order to absorb them.
This is why collagen is more easily digested than gelatin: it's already broken down into peptides, making it, in a sense, “pre-digested.”