Hedging

I’ve read that Net investment hedges in a foreign operations work essentially the same as cash flow hedges. I know with a cash flow hedge if there is any over-hedging this is considered the ineffective portion and taken to P/L but an under hedge isn’t considered ineffective. Is that exactly the same for a Net investment hedge?

Also, when the results of over-hedging or under-hedging are shown in the accounts would they be netted off?