If the part number or standard number are the same for different applications on different aircraft then the hardware should be interchangeable. However if the item has a special number then it should only be used in that particular application. Some times in US standards you will have a common bolt but the head is painted green. That means it was checked for cracks and inclusions and although it has a common number it can only be used in that specific application. If you have a high shear or close tolerance bolt it will have a different part number from bolts of the same size. The same should be true for other hardware items.
I will end this message with the caveat, I think.
Based on the following post, I should have kept my mouth shut. However based on the following post you guys have to work to a terrible system. Hopefully it is never adopted in the US.
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The Cat
[This message has been edited by Lu Zuckerman (edited 05 March 2001).]