Saw a rifle for sale listed as ".375 Flanged Express Short". Are these one and the same?

From what I can tell, the .375 2-1/2" case would be very close in size to my .38-72 WCF (essentially a .405 WCF case, very gently necked down to take 270-grain bullets of 0.377" diameter).

Sounds anemic for a double rifle. Could a .375 2-1/2 be (safely) rechambered for the flanged version of the 375 H&H?