Any differences between any of them comes down to bullet differences and abilities.

Finn's findings AND writing of a .366" 286gr. soft and solid (2,340fps) being the equal of a 370gr. @ 2,650fps and a 300gr. at 2,480fps on African game is rather enlightening. I well remember an article where he noted exactly that. He'd bunched many rounds into categories. IIRC, he included one of the 8mm's with the 9.3x62 and .375H&H as well.

As to running or walking moose - a bull grunt usually stops them for an easy shot. I've never had to shoot an unwounded running moose (some clients shoot poorly) but even the .458 2" worked on those.

I don't understand why a moose would be running when it was such a long distance from you?

As my late mentor and friend Lester H. Hawkes used to say, there's no flies on that cartridge".