Finn Aagaurd once wrote in Africa he could see no difference between the 9.3x62 and .375 H&H & lumped them together. While
I agree with Rule303 on the numbers differences, actual visual similarity on the animals Finn shot, could very well have shown the same actions/reactions.

In other circumstances, there would likely be a difference - or rather should be a difference. That it did not happen with Finn's experience might show his sample size was not large enough, is all.

On game, given similar bullets, the 9.3x64 and .375H&H would/should show virtually identical performance at the ranges both are likely to be used.

IMHO, of course.

My old Oberndorf 9.3x62 made 2,670fps with 270gr. Speers and 2,519fps with 285 Speer Grande Slams. I haven't shot anything with it, yet, nor my new(er) 9.3x62 on a Mk10 Mauser action. I haven't even chronographed that one - yet.

I measured 2, 9.3x62 Sako factory load cases for water capacity and got the same #'s as my .375/06IMP at 78gr. They were fired in a Styer Mann. rifle.