No, not really. The Germany comparison is far more apt.
You have a relatively stable, free, and prosperous country bordering on a very unstable, oppressed, and poor country, with a "border" imposed between two populations of the same "people" by a communist regime only interested in its own survival.
Removing that artificial barrier between the peoples would eventually end up with a similar situation to what happened when East Germany ceased to exist as an independent entity.
Now, HOW to cause this to happen in the NK/SK situation...who knows?
The biggest impediment is China continuing to prop up the regime in Pyongyang. If they withdraw their support, I don't see the NK regime continuing to function long. But, how do you get that to happen? There are many issues that would make such a situation from occurring, not the least of which China has no interest in a failed state, with millions of "refugees" on it's eastern border.
It is a sad situation, and there is no easy solution.