For EL, all versions within a major version are compatible (binary, config locations, package versions). 8.1 through 8.x is a minor version change, we can rely on it to make no changes that effect the user or any software running on it. That’s what people pay Red Hat for, that assurance (and we get it for free in Rocky/Alma and other EL versions as a side effect, though it’s probably slightly less assured than RHEL). Going to 9 is a major version change.
For Ubuntu, all 24.04.x versions are functionally the same, as far as we’re concerned, but 24.10.x is not (and is not an LTS release).
For Debian, major versions are what matter. I don’t know if they even have versions for updates there. So, Debian 11 is always Debian 11, AFAIK. Even if they have minor versions, any major version should be treated the same by us/Webmin.