No. Once redeemed, the key is burned onto your PSN account. However, you can use Console Sharing and Offline Play on PS5. If your friend logs into your console as the primary user, they can play the game on their account without buying a second key.
Many keys (especially pre-order or special edition versions) include bonus in-game currency (up to 1,000,000 credits) and car packs like the TOM'S Supra or RX-VISION . Critical Buying Tips gran turismo 7 activation key