According to Nosler, the 7mm Rem Mag shoots the same 160 grain bullet 148 FPS faster.
So if 148 FPS is crucial, get the 7mm Rem Mag.
P
Sad thing is with bad loads you might see that much variation from cartridge to cartridge. Also a slow barrel on a 7 mag and a fast barrel on a 280 may shrink that gap up even more.
