Hi Frepyou616 - Welcome to the forums!
I’ve answered each of your questions below.
- The PS4 and PC versions are different. From the Console Version FAQ
As the PC version is still in Early Access with regular changes, we wanted to release a slightly older, more stable version of the game to console first. This version is considered its own complete game and is not considered Early Access.
… While we do not have a set list of items and features or a timeline for when items will be ported across from PC, our aim is to bring as much as we can over to Console.
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Stranded Deep is digital only.
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Each platform is a separate purchase, there is no cross-buy for Stranded Deep.