@Rule 303
Loaded with projectiles of similar sds and velocities probably not.
Loaded to their potential yes.
Then the 375 wins hands down.
The old cordite load in the 375H&H the 300gn soft or sold was easily out done by the 9.3x62 in penetration stakes when loaded with a 320grain at 2,200 to 2,300fps . The Whelen with 310s is in the same boat.
In days of yore according to the 9.3x62 journal a lot of PHs preferred the penetration of the 9.3x62 over the 375H&H as the 375H&H drove the 300s of the day to fast causing them to over expand or in the case of the round nose solids bend and deflect off course after hitting large bones.
An RWS steel core solid in the 9.3x62 of the day would penetrate an elephant skull from side to side. The front on brain shot with the same bullet they would sometimes find it lodged in the spine.
The 9.3x62 journal is a real eye opener in what it will do.
Bob