The Anza range of MANPADs is based on Chinese MANPAD designs, themselves clones of Soviet/Russian MANPADs, and not on the Stinger. If you view photos of the Anza system the resemblance to Eastern Bloc weapons like the SA-7 Strela are quite clear, whereas it seems to share very little if anything with the Stinger.

Neither the Anza nor the Stinger (with the exception of the unordered Block II variant) could be regarded as superior to all other foreign MANPADs as both are handily outranged and otherwise bettered by newer fourth-generation MANPAD systems.

People need to get over the idea that any mention of a surface-to-air missile in Afghanistan must mean it's a Stinger. It's unlikely any of those ancient Stingers still work and the Soviet/Russian MANPAD variants were distributed so widely around the world that pretty much every two-bit terrorist has one these days.

To clarify for other readers, the Stinger is a U.S. made MANPAD (Man-portable air-defense systems). If the Taliban have any, they are 20 year old missiles left over from the war with the Soviets, and they are most likely non-functional, since they have a limited life time. It would be embarrassing to the U.S. to loose aircraft to Stingers, but if there are any left that still work, there probably aren't very many, and the risk is limited. It's more likely that the Taliban has managed to acquire newer MANPADS (probably a Soviet design). This would be especially scary if these missiles were being supplied by the ISI or the Iranians, since it's then possible that the Taliban could acquire quite a lot of them.