Neither does adding a code to your account to which already has a code attached from 1.0
You get your 14 free days and account already has a PC code registered .... You can not register another. You shouldn't have repurchased a PC key.
If you purchased a ps3 game/code then you would get the 30 days for your account and the ability to play on both systems since you already have a pc code registered to that account.