The "Suwanee" King, as I understand it, is a Florida/Eastern intergrade from Northeast Florida, specifically the areas surrounding Jacksonville. Not sure exactly where the name came from, as the Suwanee river is quite a bit west of there. The pictures you posted, especially the top one, are what I think of as a Suwanne king. Kind of a light colored intergrade look. Like I said in my earlier post, apparently used to be very common around Jacksonville, now hard to find. I don't think there is a specific description of a "Suwanee", just a name that somehow came to be used to describe intergrades from that area.
Todd