As you just pointed out, they both have the same systems. This is like a reason why the technology of the Dinosaur ride (originated from the Indiana Jones ride in Disneyland) has not been duplicated elsewhere in the same resort.
We shouldn't just repeat the same things in the same parks over and over, or they might become too competitive with each other. There once was a thread I did where I contemplated this very thing, and many people insisted that the parks are seen as complimenting, not competing with, each other:
https://forums.wdwmagic.com/threads/do-the-parks-seem-to-be-competing.703108/#post-4465922.
Anyway, one of my ideas, as I said before, is something like Timeless River, like the area in KH2 revolving around old Mickey cartoons. Maybe have a Steamboat Willie ride. But even so, it would be difficult given the Goofy coaster and Mickey's Fun House ride over in Storybook Circus. Again, I don't want to spread things too thin.