I'm not entirely sure.
But in light of the continual .308 vs. .30-06 argument, I have seen differences. But the comparison is so apples-to-oranges it's not even funny. a 22" barreled .308 vs. a 24" .30-06. The .308 shooting Federal blue-box factory 180gr soft points. The .30-06 shooting stoked handloads with 180gr TSX. The .308 advertised velocity being 2570 fps, minus a bit for the shorter barrel, let's call it 2500. The .30-06 using a hefty charge of RL22 and a chronographed average of 2822 fps. That is not an insignificant difference in velocity (resulting in flatter trajectory) and bullet construction, and I'd take that .30-06 over that .308 in all honestly. But like I said, that's an apples-to-oranges comparison (well, maybe more apples-to-shorter-apples-with-less-gunpowder) because on the flip side, the .308 was about 2 pounds lighter and just that little bit more svelte and quick-handling.