A: Only if you install the PS4 version of the game on your PS5. The PS5 native save is currently uncrackable by standard editors.
I notice you're asking about "Save Wizard for Gran Turismo 7" and mention "proper piece." Just to be clear: save wizard gran turismo 7
: Plug the USB into a computer and open the Save Wizard for PS4 MAX software. A: Only if you install the PS4 version