One spreads out …
And the other discharges from one spot.
Sheet flow in Big Cypress National Preserve, Florida
Spring flow at Silver Spring in Ocala, Florida
Other differences? One flows all year round. The other lasts for a few months. One gushes fast. The other moves as slow as snail. One is ground-fed and the other gets its water mostly from the sky. One is deep reaching down into underwater caverns that require Scuba gear to explore. The other is shallow thus allowing you to explore by foot (so long as you’re willing to get your socks wet).
As for similarities? Both are crystal clear in their undisturbed state. And both are tranquil beyond belief. Most of all, both need our help to keep them that way.