French threaded freewheels are rare. Italian threaded ones are a bit more common. An steel-bodied English or ISO freewheel will go onto an alloy Italian hub (with some effort, being careful not to cross-thread, and you can't use an Italian freewheel subsequently) but the other way around is best avoided.
French freewheel threading is a metric pitch and cannot be interchanged with ISO, British or Italian.