Well, after some recent lost against some players I've revised the data I had of the picks. Anyway, in most of those games I couldn't use middle east reinforcements but only Indian (106) against Asian (303), so I got outnumbered quite fast.
An ideal fight for Afghanistan would'be to get all the western countries while still having the frontal war in Burma, since from here it is all GW/Imp spam until win. Nonetheless, getting Burma before Turn 6 (before North Korean players lands in Vietnam) is very hard and dependable of rolls, at least, in my current expansion. Getting Thailand is even sweeter due to the income there. I am current developing an expansion that allows me to expand faster to Indochina while not having any economical harm at all. Tried replacing Gulf with URAL income but this expansion requires a lot more work.
The question
"Can afghanistan beat north korea in 3k?" and the answer
"yes, it can" aren't completely proven even though we already know that such possibility exist. Until an expansion / gameplay is found that seems balanced in this aspect, I'm sorry to say that GW North Korea (and no other strategy) is overpowered.
But since some players still believes that Afghanistan have no chance against North Korea, I'll post the income and reinforcements of their respective zones.
Eastern Asia at 100% = 6430 income, 303 reinforcements.-
http://i.imgur.com/WqfbV2L.jpg
India and ME at 100% = 6,394 income, 462 reinforcements -
http://i.imgur.com/RYgfMT3.jpg
Total: India and ME have 36 less income and 159 more reinforcements. But since syrian said that it doesn't matter because the economy grow fast, I've took the care to build the stats after 17 turns.
Eastern Asia at Turn 17 = 9,845 income, 340 reinforcements -
http://i.imgur.com/x5Mr5px.jpg
India and ME at Turn 17 - 9,783 income, 518 reinforcements -
http://i.imgur.com/OxZKZR4.jpg
Results; India and ME have 62 less income and 178 more reinforcements The economy difference isn't that high due to the city population, which grows more in the ME and India than in Asia due to them having more cities.