PS4 to PS4 registration code

Guys, my PS4 had "blue light of death" and now it is "dead", i'll receive a replacement next friday so my question is: Can i still download FFXIV (with same account) with the same registration code? Or do i need to buy another copy of FFXIV for my new PS4? Please any info about this would be really appreciated.

As long as you login in the new PS4 with the same PSN account you'll be able to re-download the game for free via the Library (NOT from PSN Store). You might need to make your PS4 Primary one as well (if the other one died that's what you want to do anyway).