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To paraphrase, what you're asking is "Can I mix JIS and ISO taper cranks and BB?".
That depends upon who you trust: Sheldon Brown predicts all sorts of dire consequences, whereas Tstr says otherwise.
But there is a third way...
My own experience is that modern JIS and ISO are interchangeable, but older kit does vary: by "modern" I mean from the mid-Nineties.
A quick Duckle suggests that you're in a bit of a pickle: Apex were offered with both JIS and ISO tapers.
Scilly.Suffolk-
To paraphrase, what you're asking is "Can I mix JIS and ISO taper cranks and BB?".
Thanks for the reply. Was more getting at, can you use a modern sealed JIS bottom bracket (square taper) with these older cranks? The Velo Orange one’s seem to be the only ones I can find with the right length spindle with Italian threading.
Poetic
Got some SR Apex cranks. Pretty sure they are JIS, but not 100%, I have a few SR bb’s that are ISO. Bike is Italian threading and cranks take 119cm bb. Could I use a Velo Orange bb (found one at 118cm, Italian) for it, it’s JIS. Prefer to use a sealed one, as it’s for a friend who won’t be able to maintain it herself.