1.
The devil is in the details, I was under the (mistaken?) impression that the Taepo Dong 2/2A was the Shabab-5, and the Taepo Dong 2C/3 was the Shabab-6.
http://www.globalsecurity.org/wmd/world/iran/shahab-6.htm
Never heard of a Shahab 5/6 before. I think this is a good indication of how reliable that source is: "It is based on public information, circumstantial evidence, informed speculation".