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@hilarystone
Yes I would agree that if you're looking to achieve a specific chainline the difference between JIS and ISO could be significant - but in my experience cranks even of the same make vary more as to how far they sit on on the square taper - this does not generally matter when using gears but is of course critical if you are setting up a fixed wheel. My general preference when building fixed is to use a BB which has lockrings both sides in order to fine tune the chainline exactly.
Hilary