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Metric threads - ISO 965-1 and BS 3643

Metric threads - ISO 965-1 and BS 3643

Metric threads - ISO 965-1 and BS 3643

From my understanding, BS 3643 is based the suite of ISO standards, so much so from my experience that I'd go so far to say it just paraphrases them.

I don't know if this is my having worked for a "European" companies for so long in the past, but if BSI has adopted and published the ISO standards for threads (particularly evident seeing as I have a copy of BS ISO 965-1 in this instance), why do they continue to issue an alternative but essentially identical standard?

Is there something fundamentally different that I'm missing?

...and from the perspective of drawings (and I may have to defer to the GD&T forum here), is there a difference between "Threads to ISO 965-1" and "Threads to BS 3643" (on an ASME Y14 drawing, just to throw every flavour in there)?

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