NK could get honestly scarier in several different ways than China. China at least has half decent healthcare, and half decent crisis response and supply production.
North Korea is half functioning on a good day, and a large chunk of its population is starved, sick, and as such heavily immunocompromised as the norm. They will be dropping like flies if the disease spreads among them. That said we (and a lot of them) won't hear much of it if it happens, because you know, North Korea.
On the "bad for NK, good for the rest of the world" side, NK also has tightly closed borders even at a normal time, in particular with places that aren't China, so whatever happens there is unlikely to affect the rest of the world much...
Kim won't want to risk more sanctions or even a war when his divisions are in disarray due to the disease, nuking own cities will be a bad case of "too little, too late" that his generals probably will talk him out of, in fact it might become an opportunity to move negotiations with NK ahead a lot because SK and USA will be in a much better position to send help than China, which is struggling to get enough medical supplies for itself.
That also brings up an important distinction about the death rates. It's quite possible, even likely, that the official death rates are, in a way, completely accurate - for people with full access to first world grade healthcare through the whole time up until recovery, especially if they are among those who develop complications and need a stay in the ICU.
But for people who don't fit this little caveat, they can go only up, and by nature of this caveat, in places like China and NK they may not even be properly entered into the official statistics once some chaos spreads.