My '93 (33E with sear) looks like the one on the left. The right seems to have an additional 'feed ramp' built into the design that goes under the bolt head when it's in battery. I'm unsure of the lineage of which came first, but both are interesting, and I hadn't noticed that before.
If you look closely, you can also see that the magazine interface tab on the lower edge of the trunnion is wider on the right, vs. the '93 trunnion on the left. Interesting, and I hope one of the '93 collectors on here can shed some light on it,