I think there is a difference. The defining characteristic of these bows when Howard Hill developed the design was the bamboo limbs. He went to Japan and selected one of the many varieties of bamboo and instructed the farmer/forester who grew them on the size he wanted. Bamboo is lighter in weight than any bow limb wood. Yew wood is a close second.
I believe that the Howard Hill bows that have bamboo or yew cores, maybe with a decorative wood lamination on top, will likely perform best. The present maker, Craig Ekin, says that the 'Wesley Special', five lams of bamboo is the best performer.
But Mr. Hill's two favorite and famous bows, 'Grandpa' and 'Grandma', each had only three lams of bamboo. This design is known as the 'Tembo.' The pet bows of many old hands, me included, happen to be of the Tembo design, three lams.