That's a good question. But I don't think China sees North Korea as an ideological soulmate - for that to be true, North Korea would have to be following a more reformist path like the Chinese themselves. I don't even think the fall of North Korea to the South would worry China on an ideological front - South Korea seems to have so much more in common with China - in terms of economy, culture etc - than North Korea does.
I suspect the Chinese government see North Korea as an unexploded bomb, best left propped up, stable and undisturbed. The worst case scenario is that North Korea tries to take the South down with it, starting a major war and destabilising the world economy. Even if North Korea were to go out with a whimper rather than a bang, I can still see the risk of refugees and it becoming more of a burden to it's neighbour than it is now. I think that's why China has not prodded North Korea to follow it's path since 1978.
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