Do you mean geared freewheels as in 3 and 5 gear blocks? If so no, those are the same threads again... I'm pretty sure.
Correct, Sheldon;
Conventional Freewheel-type Hubs
The cheapest way to convert a multi-speed bicycle into a singlespeed is to use the original rear hub, assuming that it is made for a conventional threaded freewheel. A single BMX freewheel will thread right on. Unfortunately, the chainline is likely to only work with your granny gear unless you re-space the rear axle and re-dish the wheel.
Correct, Sheldon;