ORIGINAL: Matt / PA

5grs will mean NOTHING.
Many of the bigger traditional braodheads like Snuffers (at least the old ones anyway) could vary around 10grs just from head to head.
I think I saw somewhere that unless it did something drastic to your tune it would be all but impossible to see a difference in very large weight differences. I know I can shoot my 145gr heads and my 200gr heads side by side at 15 yards and I can't see a difference in point of impact although I'm sure some slight variations are going on.

Seriously 5grs means absolutely nothing for what you are doing. I shoot 145gr field points from my recurve and switch to 150gr Snuffers and they hit the same place with the same flight.

don't bother trying to match them exactly unless it's going to just ruin your day if you don't.