'90-'95 are may be 43mm, they have shorter travel, and probably a better choice for a more street oriented bike. Also they come with 2 caliper brake calipers which are slightly stronger.
'84-'89 forks have longer travel, and probably a better choice for a bike that will see lots of off-road.
Since you'd also have to swap triples, and brake caliper, it may be cheaper to just stick with which ever you have.
Spam alert: I'm parting out 2 XT600s, so I have most of these parts available for sale - forks are on eBay, but ending soon with no bids...
I hope this helps, good luck!
Joe
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