Carbs in general are sugar, just in different forms. So when they list a sugar content under the carb content, they are essentialy listing the simple carbs, sugars that will have a significant insulin response. They aren't harder to digest, they will just give you a quick spike in insulin, such as a quick energy rush which will come down as fast as it went up.
-------------- If you can squat heavy and have solid sh*ts, what more can you ask for in life?