I guess I looked at the buckle and way the tail works and see lots of similarities. But of course, you're right, many webbing belts have similar buckles and work in a similar fashion.
@Mirolynmonbro - I suppose "stiff" is the wrong word. If you hold a 5-stitch CSM and a Specialist up, the Specialist will "flop" more. But that's only half the story, the Specialist cinches tighter and the core they use has greater rigidity (resistance to twisting) than the polymer. The polymer is thinner and flexes more it's also not as wide in the core as the Specialist. Basically, the Specialist is 3-layers of webbing vs. 2-layers + Think layer of polymer (assuming you have the CSM).