I'm an editor for a very small, obscure dmoz category that will remain nameless.
If they're all distinctly different sites, meet the criteria for the group, and you submit each of them once, it's cool.
If you submit them over and over again, that is not ok, and you will need to RTFM. That's a big category, so there is backlog, but it's not as if submissions just go away. Editors have tools for checking redundancy easily, and oversubmitting is a violation of dmoz guidelines, and constitutes editor abuse.