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@Bernhard
I think the standards are different i.e. JIS and ISO, no sure which is which but Shimano isn't completely compatible with Campy BBs, or so I've been led to believe. Off to check with sheldon.
Okay, your right, the difference in the standards is that ISO has an end dimension of the square spindle that's 0.2 mm smaller across the flats than JIS. Will give it a go before I splash out on shiny bits.