I believe there is cooperation between Iran and North Korea about the propulsion system of the cruise missiles.
probably not only that, the sanctioned and embargoed countries are pushed to collaborate, therefore not only Iran, but also Myanmar, Cuba, etc. and not only at the military level, which can be with the classic direct export or transfer of knowledge and then be implemented in specific countries. A recent example in the military field is the naval cannon installed on some SES (Surface Effect Ship) units of the North Korean navy which looks a lot like a compact Oto Melara 76/62, thus excluding the transfer of technology by the Italians, this proposes a collaboration with the Iranians already making their own version of the Compact 76/62 called Fajr-27, I'm not thinking of a direct export of the entire system but of technical support and related projects.
A recent presentation of military systems also saw a version with a stealth turret of the Compact,
even if the caliber of the gun has not yet been declared (classic 76mm with Western-type ammunition, or 76.2mm of the Soviet-Russian-Chinese type, or also in 85 mm caliber widely used in North Korea).
the same stealth dome is in the model of the new Iranian corvette project
Conversely, Iran for the new CIWS Kamand may have received help making the 30mm Gatling gun from North Korea, which already produces a similar weapon,
albeit with a different cupola.