Wanted 4-speed freewheel

This is complete speculation, but looking at pictures of 4 spd vs 5, it looks like the same freewheel with an extra cog. Might it be possible to hack a 5 speed (plentiful) back to 4?
Or indeed just put on a 5 speed one - is it a purist build?
 
Thsb
This is complete speculation, but looking at pictures of 4 spd vs 5, it looks like the same freewheel with an extra cog. Might it be possible to hack a 5 speed (plentiful) back to 4?
Or indeed just put on a 5 speed one - is it a purist build?
Thanks for your reply. Not a purist build but for some reason a 5sp freewheel wouldn't go on, according to our mechanic. The original 4sp we had to remove with a vice as it was seized on
 
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