One big difference is the existence of giraffes. The Shoshone may have gathered a great deal and hunted the occasional rabbit, but the !Kung hunted giraffes. Without B-52 bombers or high-powered rifles, how do you hunt a giraffe? Cooperation with other hunters might be a good start...Yes, I recognize that males are biologically driven to go out and hunt giraffes. But, even so, if I was assigned the task of solo-hunting a giraffe, I can imagine many modern contrivances that I could see as helping me out, and, yet, a B-52 bomber would not be one of them. Even if I knew how to fly. Can you even operate a B-52 bomber (that is, fly and bomb), without cooperating with someone else? And, even so, can you really bag a giraffe with one?
* Aside: As some readers know, I'm especially fond of the word "marmot", and for some time it's been one of the most-favorite favorites on my enunciation candy sidebar list.