x700e_full.tgz
it means that it is X11 version 7.00e and it
contains all you need in tgz archive to install
the BBS. On the other hand, a name like
xd700g_full.tgz
means that it is not X11 but daemon version 7.00g
and it is also complete to unpack. Further,
x700f01.tgz
and
x700g.tgz
are "upgrades" to any previous "full" package.
For example, after I have upgraded to x700g.tgz
I started to run X11 LinFBB 7.00g (04 August 1998).
Btw, X11 versions are not maintained anymore, but
I still run it here. It has some bugs but I like it.