Here are all of the currently released screenshots for both platforms. The PS4 version screenshots are at 4K resolution suggesting they were taken on a PS4 Pro or PS5. The PS4 cannot play 4K games.
All Red Dead Redemption PS4 and Nintendo Switch screenshots - RockstarINTEL
Red Dead Redemption Remaster, red dead redemption 1 remaster
From the Playstation Showcase, GTA Expanded & Enhanced has been delayed : r/gtaonline
All Red Dead Redemption PS4 and Nintendo Switch screenshots - RockstarINTEL
Rockstar Games has released the first screenshots of the Red Dead Redemption re-release for PlayStation 4 and Nintendo Switch. The difference with the original game is noticeable
Red Dead Redemption is coming to PS4 and Nintendo Switch, no remaster - RockstarINTEL
Rockstar Games on X: Red Dead Redemption for Nintendo Switch and PlayStation 4 is now available from the Rockstar Store and other select retailers for both digital download and physical purchase
All Red Dead Redemption PS4 and Nintendo Switch screenshots - RockstarINTEL
I played Red Dead Redemption on Nintendo Switch, here's what it's like - RockstarINTEL
Red Dead Redemption on PS4 and Nintendo Switch Confirmed, PC, red dead redemption 2 on pc or ps4
New 'Red Dead Redemption 2' Screenshots Revealed
Red Dead Redemption PS4 and Switch physical copies do not include map - RockstarINTEL