Board Thread:Lore Discussion/@comment-71.58.163.238-20130703034923/@comment-13446185-20140223163748

Actually there is no difference between Dragonblooded and Dragonborn;

"Because of this connection with the Emperors, however, the other significance of the Dragonborn has been obscured and largely forgotten by all but scholars and those of us dedicated to the service of the blessed Talos, Who Was Tiber Septim. Very few realize that being Dragonborn is not a simple matter of heredity - being the blessing of Akatosh Himself, it is beyond our understanding exactly how and why it is bestowed"

-Book of the Dragonborn