North Korea routinely attacks South Korean and US assets in its area like the sinking of Cheonan. North Korea is strongly allied with its other neighbors China and Russia.

Iran is not organized around an expansionist death cult. They have not expanded or attempted to expand at all. They are involved in lots of neighboring conflicts because they are in a region with lots of conflicts. We are also involved in lots of conflicts there.

There is no possible closer comparison for a nuclear Iran than nuclear North Korea.