The 13 hubs seem very similar to the 12's. Front is a smig lighter and rear body is a slightly different shape. http://www.bitexhubs.com/upload/down...99569e3af1.pdf

And speaking of the 13's, cheap set being offered here...https://www.amazon.com/LOLTRA-Pawls-.../dp/B07427TPFQ I wonder if the 13 has the "anti bite" strips on the freehub?