Manfrotto Superclamp and Karlite Super Clamp, Whats the difference?

[Russ]

http://karlu.com/karlite-super-clamp-with-013-spigot-035-p-18247.html
This at 14.99

and

This at 22.50
http://karlu.com/manfrotto-super-clamp-035-p-3934.html