EPEL 10 onwards will use a new model (compared to EPEL 9 next):
In short, EPEL 10 will address Centos Stream 10 (which carries “next RHEL 10 minor content”), and there will be EPEL10.x for each released RHEL 10.x.
ELN provides a selection of Fedora rawhide content built with EL flags, and the same is true for ELN extras:
It serves a similar purpose as EPEL, namely adding packages to RedHats selections of packages; and just like with EPEL, every Fedora packager can “add” a package. (There are no branches for ELN, though, just requests to rebuild the rawhide package.)