Different worms altogether.
In general (and almost exclusively on this board), "superworm" refers to the larvae of species Zophobas morio. For beardies, they are considered a good feeder for larger dragons. I breed my own supers, and theya re my dragon's favourite feeder (she'll go for the superworms before she goes for dubias (which I also grow).
In general (and almost exlusively on this board), "mealworm" refers to the larvae of species Tenebrio molitor. For beardies, they are discouraged as feeders since they have a high chitin content in their shells and can pose an impaction risk, as you know.
I added the qualifiers above, since there seems to be a lot of geographic variability in the common names used for each species. I have seen what I call "superworms" variously called "kingworms, "super mealworms," "giant mealworms," and others. The term "giant mealworm" is also used to describe a mealworm that has been treated with hormones to increase its size. In North America, "superworm" is the usual common name for Z. morio, but in other places, the common names seem to vary.
This variability in common names for a species is common in many fields. Personally, I have had to deal with the same confusion while identifying the fish I see while scuba diving, in identifying garden plants, trees and more. It is to the point that I try and stick with the latin names once I know what something is. The roach breeders have the right idea, sticking to calling most of their roaches by their latin names (eg. dubia, etc.) to avoid confusion.