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The basic idea is, it'll look for the imported objects, and update those. If they no longer exist in the actual element, they'll be deleted. If they exist but as different literal objects (eg. you cloned a node and deleted the old one for some reason) then the one that was already imported will be removed.
It's one of those things that would be very hard to prove all the edge cases for, which is why I haven't tracked this down.
But in general, the update system isn't perfect. It may break things. If so, try just re-importing. Try not to change too much about it in the scene itself unless you have to, so that the update will go more smoothly. But be prepared to rejig some stuff if it breaks.