Oh, you're one of the people that believe that a perceived "sugar rush" has something to do with diabetic glycemic excursions? They're entirely different phenomena. Dismissed. But thanks for the irrelevant link!
What is the difference between a diabetic glycemic excursion (what you said) and a postprandial glycemic excursion (what I linked)?
There's no difference -- postprandial excursions are a diabetic phenomenon, and have nothing to do with what non-diabetic individuals think of as the effect of sugar and fiber on their health and mood.