The new 321 is finished exactly the same as the originals are in terms of decorative work. The plating is apparently different, but the simple graining on the bridges, very simple straight grained finish of the steel parts (with no anglage), is a very industrial finish to say the least. Omega has made this the same as the watches that were in the Speedmasters originally - it was a "tool watch" back then, and didn't get any serious fancy decoration. The finish on this movement is equivalent to that applied to the regular 861 and 1861.
The 863/1863 has Côtes de Genève on the bridges, perlage on the dial side of the movement, and even at times under the bridges, polished anglage on all the steel parts - it is most certainly finished more completely, and according to Omega's view, to a higher level.
Cheers, Al