The IED technology has evolved, and the Chinese MANPADS are not identical to our Stingers. I do think every tool has its own idiosyncrasies. When we field a new weapon, we send trainers to our soldiers. Plus, the people Iran is training are probably not the very same ones who’ve been fighting for the last 30 years.
Iran is without question giving aid, weapons and some limited training I'd suspect to Shia fighters in Iraq....but the notion they are giving training of any real value of level to the fighters we are facing in Stan....I just don't buy (hell, we'd be better off if they do....The guys we are fighting in Stan are much more proficient then are the Iranians).