Magery Spells and PvP & PvM

I was wondering with Magery spells, Does all the spells have the same affect in PvP as they do in PvM? I just got to thinking about it and wasn't sure. Are there some that don't work in PvP at all? I have never PvP and not looking to start but the knowledge of how spells work in a PvP situation, might come in handy for my defense one day.

Thanks in advance to all ,
South.

Well for one thing, spells do double damage in PvM, other wise it's all the same I think.

Thank you very much.