PlayStation: “Fortnite's PS4 version isn't available to download on ps5. Play the PS5 version” Also PlayStation: “Here's BOTH PS4 AND PS5 version of Worms Rumble available to download for everyone on ps5” :
Fortnite PS5 vs PS4 - Worth the upgrade? Frame Rate Comparison - YouTube
PS5 Fortnite Custom Controller – LaZa Modz LLC
FORTNITE | PS4 VS PS5 Graphics and FPS | Comparison - YouTube