Yeah did that and got as far as exporting from the PS4 game and finding it to import on the PS5. Problem is when I select the save I want to import, the game crashes - freezes.
I emailed Pirate Division and the came back with this:
" Congratulations in upgrading your KSP to Enhanced Edition. To answer your question about importing the save file from PS4 to PS5, the new version was built from the ground up, save files from the previous version will not be compatible with the new Enhanced Edition. But, that does mean you’ll be able to get those trophies and achievements a second time!"