You are doing fine with the translator
I still do not think it is Spanish. Even the "reutilized" German M35 helmets have the badge holder welded to the front of the helmet and I don't see it on the Afghan helmet. I can not imagine them bothering to cut them off. The Spanish helmets have a different rivet (flat) vs. the German round (though I do not know if 100% Spanish helmets have flat rivets). The liner, to me, does not look like a Spanish liner. It is too crude and the chin strap isn't the same style.
Also, I do not know of any history of Afghanistan purchasing surplus items from Fascist or Democratic Spain. Especially during the time of Soviet occupation.
The question... why would a puppet Soviet state purchase things from a country allied against the Soviet Union? Especially one that was Fascist until the 1970s and beat Soviet backed forces in its Civil War? The funds for the helmets came from the Soviet Union, so that makes no sense
What makes more sense is the Soviets took some of the millions and millions of German helmets they probably still had lying around and shipped a few thousand to Afghanistan with cheap replacement liners.
Of course, I could be wrong. Just because what I say is logical doesn't make it true
But generally the most obvious answer is the correct one.