Hmmm... seems the mono is indeed only available on the US BD set (this comparison only looks at the region B Holland release, but that can probably be taken to represent all of the European releases given Fox's standard operating procedure: http://dvdcompare.net/comparisons/film.php?fid=13793).
FWIW, the US set is terrific and well worth an import if you can play region A discs (which these most certainly are).