This is taken from the manufacturer of a HBCD
"Cluster Dextrin® works similar to other types of carbohydrate ingredients, but has its advantage in building muscle, burning fat and delivering constant energy. Typical macromolecular carbohydrates are less soluble than Cluster Dextrin®, however, low molecular carbohydrates exhibit higher osmotic pressure, as does pure glucose solution. Cluster Dextrin's gastric emptying time is incomparable because of its capabilities to quickly reach the small intestine and allows for a quick ramp-up of endurance. Solubility is a main factor of Cluster Dextrin's functioning.
. Most sports drinks contain carbs with a low molecular weight. These enter the bloodstream quickly, and the body responds by rocketing insulin secretion which, in turn, obstructs the burning of fat. High molecular weight Cluster Dextrin® degrades slowly, balancing insulin secretion with lipid breakdown.
Quick to empty the stomach but slow to degrade in the intestine. To me this sounds very similar to the information on HDP.