You could say very much the same for the .270 Weatherby Mag and the 7mm Weatherby Mag. Check out the dimensions of those two little stable mates.
I wonder how many times those have got crossed over. "The clerk in the store assured me they were the same"
You could quite probably fire the smaller bullet in the larger rifle and not even realise except for poor accuracy - but don’t try it to see!
If you are talking about the risk of chambering the wrong round in a rifle the belted magnums must rate absolute highest on the danger list.
With a rimless cartridge the case headspaces on the shoulder so even a small difference in length is enough to prevent you closing the bolt or the round dropping in too far to be fired. So although there is always a risk, much of the potential for error does not actually reach the final consequence ie a blown up rifle and an injured shooter.
Most of the belted cases share a common set of base dimensions that can be traced back to the .375 H&H Mag. and they all chamber on that identical belted base.
Some later cartridges, like the Weatherbys, changed the dimensions slightly but not enough to make them safe.
A wrong cartridge will therefore chamber like it was meant to be there and fire.
Cartridges in this catagory include
.375 H&H Mag, and its decendants
.244 H&H Mag
.257 Weatherby Mag
.275 H&H Mag
6.5mm Rem Mag
.264 Win Mag
.270 Weatherby Mag
7mm Weatherby Mag
7mm Rem Mag
.300 Win Mag
.300 H&H Mag
.308 Norma Mag
.300 Weatherby Mag
8mm Rem Mag
.338 Win Mag
.340 Weatherby Mag
.350 Rem Mag
.358 Norma Mag