GNU Linux-libre silences requests for blobs, so that they don't induce the installation of the blobs or their use, and removes documentation recommending them for the same reason.  in the process, we end up disabling the requests, because there doesn't seem to be a way to leave them active while achieving the intended goal of not participating in inducing their installation or use
Debian doesn't do any of that, although AFAIK the few non-Free blobs remaining in the kernel are moved to the non-free repos that are allegedly not part of Debian.  I don't know whether the drivers that depend on non-Free blobs are in contrib where they belong per Debian's own rules
as for sharing packaging...  I don't know of any explicit cooperation, but I suppose those of us who build GNU Linux-libre .debs use Debian-created and maintained tools, such as make-kpkg.  I suppose that's not the kind of work-sharing you're asking about, though.