It will be merged.
The linked mbox was extracted from the server at the same time the
nabble forum was created so no overlap but even if there's
overlapping, at least for previous experience, Nabble support team
will merge the archives and no duplicated posts will be produced.
Cheers
--
Jorge Sanz
http://www.osgeo.orghttp://wiki.osgeo.org/wiki/Jorge_Sanz