I've seen people post about quite a bit of variety given the area is quite huge. At least prewar anyway. Long flowering, short flowering. Given the mountain terrain it isn't illogical to think that people didn't travel much and that pollen couldn't necessarily be easily dispersed everywhere. I do know I had some Afghani when I was younger that was completely paranoia inducing. Granted I was a teenager and our brains are quite a bit different, but it wasn't like most Afghani's I've had. Recently I've run into one at a dispensary that has given me the giggles and the buds are kind of sparse and not that large. They really don't look good, but they smell really nice (and unique as hell) and they work quite well even for someone with high tolerance like myself. Reminds me more of a sativa than an indica again.
Well indica/sativa is a somewhat arbitrary distinction. There are low CBD and tall growing subcontinental strains for sure. Also, individual reactions to any strain can be fairly different. Not everything called "Afghani" is. . .many of the commercial "Afghanis" are actually hybrids (usually with Skunk, but sometimes other things).
Anyway, yeah, all these Afghani lines are open pollinated outdoor grown lines. Every village has its own, there is cross pollenization, and Afghanistan itself is geographically large with somewhat variable climate. Probably not just anything grown in Afghanistan is going to be what people think of when they think of "Afghanica".
All I'm saying is that the distinction between Pakistan and Afghanistan is itself somewhat arbitrary, and from a genetic standpoint, I'm sure you can find quite a bit of similarity in strains near the respective borders, that's all.