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hmm... probably the density of the material is different. The TRD blue was very heavy compared to OEM front.
I held TRD blue against Daizen red, and the Daizen was clearly thicker. I don't know about the weight however - the Daizen was already installed so I couldn't compare the weight. And yes, they are both thicker than OEM.
Now with that being said, thickness is not the only thing that affects the "spring rate" of a sway bar. Swaybars are basically made behave like springs, and if you look at OEM springs vs aftermarket, the aftermarket ones are not any thicker, yet they are much stiffer.
They definitely reduce body roll, but the rear one creates way too much oversteer, and the steering becomes too quick for my liking. I'm happy with rear OEM bar and Daizen front.