Digestion Enzymes in Carbohydrate Metabolism?
1,6-glucosidases are a class of enzymes and not just one enzyme. It does not mean that all the members of this class are the same enzymes. They catalyse the same kind of reactions but their properties and substrate specificities differ. Check BRENDA for details.

BTW, dextrin-1,6-glucosidase is a synonym for amylo-alpha-1,6-glucosidase. Other 1,6-glucosidases are different enzymes with different EC numbers.