Without disrupting your chat the one thing that you have to remember is that the Empress moderns range, including the Cold War range that is developing are all from the same sculptor and so are the same style and size, as are the vehicles etc.
The Vietnam range is a different range and created to link backwards in time to the French Indo China range, and WW2 as it share weapons, some vehicles and figures eg civilians. Therefore not considered by Empress as part of our Moderns Range.
That's the really basic and abridged reason for the difference. There is a very long complicated one as well but its Sunday.
