Thought I would try to shed a little light on this. First, Worth makes a lot of "Clears". We make a lot of sets, too, so you've got to be a bit more specific to really compare.
Second, not all our sets are flourocarbon. I beleive every set has some flourocarbon, and some sets are all florocarbon, but flouros are not all the same. We have at least 2, more often 3 and very often 4 different string materials in each set, even when it's an all flouro set.
Thinner or thicker doen't mean much in itself. String material is denser (harder) or less dense (softer). This is true even among various flouro formulations. The harder material is usually brighter in sound, the softer material has a "softer" sound. Pretty much everyone but us uses the same material for all four strings. With the same material, thicker strings are "deader" in sound than the thin ones.
In mixing materials like we do, we put denser material on the inside (of a reentrant set), and softer material on the outside. That balances the sound, making the "treble" (outside) strings less bright, and the bass (inside) strings clearer and more responsive. We also try to keep tensions relatively even accross the board compared to a single material set.
The "Lagniappe" (south louisiana for "a little something extra") is that the denser material in the middle, specifically the 3rd string, is not as thick in relation to the other strings as with the single material set. Here's Ryan Rodriguez with a review of our "Soft Light" set. Note how he talks about the 3rd string:
So to sum it up, it may not be that our strings are thinner overall, but you don't notice as big a difference between the inside and outside strings, either in size or in tone.
p.s: Ryan's review was part of a "test" before releasing this particular set. The good folks here on UU noted a funny feel on the 1st string. It's since been changed.