0% the quality?
I wouldn't go that far.
There are perks to both events, but Howl-O-Scream sometimes goes the extra mile with its placement of actors throughout the park. And some houses of the past houses have been near HHN levels of quality. I don't think they would have a problem doing something like that again if they wanted to.
EX: Deadfall, Death Water Bayou, NightShade Toys.
While their scare zones may be recycled, they plus them pretty much every year and get rid of the ones that no longer work.
Obviously, they can't go and change all their content every single year, but their work is still of quality and not 0 the quality.
I know you are speaking of the Seaworld event, but I expect it to follow a similar route to Tampa's event in most aspects.