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@Scilly.Suffolk
Three different standards: ISO, Italian and JIS.
Although Italian threads are cut at a slightly different angle, in practice they are all interchangeable.
As WJP says, you will need to check the stack height.
You will also need to check the crown race, as these are different.
Have at look at this.
Who is the frame made by? What BB does it take? This might give you a clue as to which HS you need.