First, I hate you cuz you got the 20th PS4 (Crying a little inside..).. But yes, when you upgrade your HDD, you just need to reinstall the game. It will prompt you like it did the first time you launched the game. Just input your existing SE account and you will be good to go. But the reinstalling of all those patches will take time. So grab some lunch or complete misc things or do w/e needs to get done.