Yep, those are 2 different ways to turn media requests from users into something oldx/jellyfin can use.
Might be worth noting that real debrid’s webDAV implementation (the protocol that lets you access the files in your mount) is a little funky, and might get very slow for large libraries (over 1k links), so itsToggle (author of plex_debrid) has a fork of rclone to fix this. There’s also a new project called zurg from the debrid-media-manager people, but it’s closed source, and the devs don’t intend on making it open source.