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Poetic
@Scilly.Suffolk
If you're asking if the current JIS taper is different to your cranks' taper, then I don't know.
There is "low profile JIS" (as used by 7400) and Shimano cranks were compatible with Campag cranks around the Super Record era, but I don't know who adapted to who's standard (or if there was a third one).
Your cranks may be ISO anyway...
Myself, I'd offer-up the cranks to whatever BB I happened to have available and see what that tells me. If you don't have any Engineer's Blue, use a marker pen to coat the taper of the BB and insert carefully (so as to not scrape down a side of the cranks); remove equally carefully and see what that tells you about the engagement.
If it looks good, then install fully, measure the chainline and work from there.