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I can add or subtract spacers to make it fit?
You can add spacers to make a lower stack height one fit, you can't subtract spacers if the new one has a higher stack than what you already have. For that, you'd need negative shims :)
There are two sizes of crown race too, you should have an ISO 26.4mm one, so beware of 27.0mm JIS headsets.
Stack height?
No.