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Diverse in Unity
How do you think they would capitalize on it instead?
I think their strategy is different and therefore they would/will use their nuclear arsenal in a way that would be a part of this strategy.
North Korea essentially wants to be left alone and that's it. The regime is blackmailing the rest of the world not because it has some great power ambitions; it simply wants to survive in its current form. Nukes (and they probably have no usable nuclear weapons as of yet) help it to both get the things they need (oil, food, other necessities) and to scare the South Koreans/Americans from taking any serious action against it.
Iran's strategy is not isolationist, it is expansionist. The country wants to assume regional leadership, and nukes are therefore perceived as both a badge of a great power, and a shield against military repercussions of its aggressive/subversive actions.
That's what makes Iran's possession of nuclear weapons so much more dangerous.