I would just leave them both as they are. Even though the LMR 12-53 would be "correct" for your IHC, without the "punch mark" it will be seen by collectors as a replacement barrel and do nothing for the value of your rifle.
If you can switch barrels yourself then do what makes you happy, it won't effect the value of either rifle. If you would have to pay to switch the barrels then I see no reason to do so.