The problem here is a mishmash of parts;

The entire ZXR400 front end (forks, triples, wheel, discs, calipers) would have to work (and potentially work very very well indeed if sprung for the lighter bike, several super fast ZXR400 racers here run stock forks and win).
But once you start mixing you're on the road to making a mess, caliper height, disc offset, wheel spacers and yoke width all need to be considered.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread