The CB400SS was only ever made in Japan. However it was grey exported worldwide, but never marketed or sold directly by Honda outside Japan. It was sold briefly in China, and it was probably reverse engineered poorly by someone or other. Since Jialing sold the official CG125, CB125 (twin) and CB250 (twin 234cc) engine blueprints to the highest bidder under the table to nasty Chinese copycat companies. I doubt Honda would have allowed any 400 single engines to be made in China. If they had every tom dick and Harry China idiot manufacturer would currently have a 400cc single cylinder in their lineup.

It does matter where a bike is made hugely. If you have three or four identical bikes, a could be YBR125, or CG125 made in China, made in India, Brazil, Thailand, Portugal, Spain or Japan (not saying a CG125 or YBR125 is made in all these countries, but maybe 4 or 5 of them). Those bikes may share the design, but the quality of the parts and assembly will vary and the local and export versions will differ (eg Sari guards in India).