3️⃣ Use the in Linux to move them to your internal ROMs folder. Hashtags: #PS4Modding #Goldhen #RPCS3 #GamingSetup Quick Resource Links
Focus on the fact that you can run PS3 games on a jailbroken PS4 using a . ps3 to ps4 pkg
If you are looking into this from a homebrew/modding perspective, you should manage your PKGs for each system separately: On PS3 (CFW/HEN) : You can install PS3 PKGs using the ConsoleMods Guide for PS3 via USB or a network server like ConsoleMods Wiki On PS4 (Jailbroken) 3️⃣ Use the in Linux to move them