Specifically French vs. everybody else. I have a reason for asking.
Whenever I've replaced a French freewheel it was with one from another French bike of similar vintage. Consequently I've never had to worry about the threading. Now I have reason to worry that someone else (not me, honest!) may have forced a non-French-threaded Suntour freewheel on a French hub. It's a long story, not worth going into juts now...
What I'm curious about is whether they might seem to fit when they really don't. Loose, tight, start-easy-but-get-tighter? That sort of thing. PM me if you wish for further details of why I'm asking.