I got in touch with support and this is the reply.
Thanks for getting in touch with us regarding the upcoming PS4 version.
You can link your PS4 version to your current PC Frontier account and it will not interfere.
Each platform is different and will not share the same CMDR data. You will have a seperate save on each.
You will would need to purchase a copy for each platform as well. You already have your PC version.
We have no news regarding transfering CMDR net worth to the PS4 version yet either.
Keep an eye on our Forums and social media pages for news and announcements.
I hope this explains some things for you and if you have any further questions then let us know.
Kind Regards,
CMDR ****
Support Wing
Frontier Developments