Todays NVA is Hanh.
Carlos the hat is down to partly angle of the pictures partly perhaps about 2mm too tall, but that's a rough guess and conjectural.
I think the biggest problem is that the brim is too flat. They would look fine on Colonial French or Italians but they don’t really look convincing for Vietnam.
The brim on the original article is actually quite steeply angled, the crown and the panel seams tend not to be as prominent.
Sorry to carp but heavily invested in this and wanting the best available sculpts.