They do. It's the same scoring system. If a junior does a quad triple it's worth just as many points as if a senior does a quad triple. It's possible F&B may have another qualifying score, but I remembered their celebration from the JGP in Colorado Springs, and the commentator mentioned that they must have earned some form of qualifying score. So I checked the ISU page with their names, and the Colorado JGP score is listed as their Personal Best.
How else would Nathan be in the running for Worlds? It's generally harder for the junior men to score as well as seniors since they can't do the quad in the SP at junior events, and they have fewer elements that are scored. I'm guessing likewise, the same is often true in dance; but this year, as I mentioned, I believe the junior pattern may have a higher base value than the senior one. Dancers, however, have an especially hard time jumping up from juniors into a senior event because they have to create a different SD to fit the senior rhythm requirements. Singles athletes have to lengthen their FS, but they don't have to select new music. That said, Nazarova & Nikitin did what was necessary and competed in dance at Senior Worlds after their junior season last year. If the Australians wish to do so for 4CCs, they can.
