Two totally different types of launch coasters and experiences (one of which only lasts 30 seconds).. Full Throttle is at least a complete circuit track and does more than just launch you once. It does a double-backward/forward launch up & over the huge loop.
And if we're going to nitpick about Six Flags having 2 (completely different) launch coasters, then lets talk about parks that have more than one wooden coaster (doesn't matter if they're different, still wood). Hell... Universal Orlando has Mummy & Gringotts in the same park, they're more or less the same with different themes. Not in the same park but... Spiderman/Transformers. Disney with its spinners (Dumbo, Aladdin), Big Thunder Mountain/7 Dwarfs (both mine train coasters).
Just because rides share similar elements doesn't make one more inferior than the other (unless you're Superman... that is the lesser launch coaster)