[Arran]

 The top of that cabinet may be neither type of walnut, I would suggest stripping some of the old finish off to get a better look. To me the grain looks a lot like that orientalwood veneer that Philco used on the front arches of their model 70 and 90 cabinets, or it could be eucalyptus veneer, as I say strip some of the finish off first. The problem with using the second cabinet as a reference is that it looks like it was refinished, which means that the veneer on top may or may not be original, sometimes people will reveneer a cabinet with the wrong species. If someone had a copy of an original ad with a description of the veneers used that would be helpful.
Regards
Arran