The 767 has been around longer, and is priced more for the budget minded people like us.
The 967 is maybe a bit newer, but when I did side by side listens (157, 257, 357, 457, 757, 767, 967, 468, all EV ND mics that I've owned) the 967 and the 468 were the only ones that didn't sound like all the other ND mics. All the other ND mics I had sounded all alike.
The 967 sounded much fuller, more balanced across the freq spectrum, which also tended to take emphasis away from the presence boost. When I recorded guitar cab with it, it sounded like it captured more low end and low mid range sound than the other ND mics. It sounded more realistic, more like my guitar speaker. The 468 is a little golf ball ND mic that is intended specifically for guitar cabs (among other things) and it is the only one that doesn't really sound like an EV N-Dym mic, probably because a guitar cab mic doesn't need the presence boost.
I think I got my 967 for $139 maybe? from fullcompass.com
I ended up selling all of my ND mics, except the 468. Since I also have an RE20 and an SM86, I ended up letting go of the 967 also. But if I wanted to pick just one EV ND mic to use on stage for vocals, the 967 would be the one. I thought it was similar to
the Shure SM86......not quite as good, but similar. I honestly believe if you do side by side between the 767 and the 967 you will definitely hear the difference, even on home gear like I use.