If he likes yours because it shoots flatter, then he needs a longer barrel. Savage states that the long range hunter model comes with a 26" barrel, but that includes the muzzle brake in the length. He effectively has a 24" (same as my 110 stealth 338lm). You have 4 more inches of barrel than he does. With equal barrel lengths the 2 cartridges are theoretically within 50fps of each other. In reality, I wouldn't put money on one being faster than the other as they're so close the person with the faster barrel will win.
If he wants flatter/more powerful he should just keep it simple: order a new longer barrel and have it chambered for 338 lapua Ai. It'll easily outrun your 338 edge, it will use the same brass, bolt head, and mags he already has. Just get a new FL die and the barrel and he's good to go.