The PS4’s operating system and hardware architecture are different from the PS3’s. A PS3 PKG is designed for the PS3’s Cell processor and firmware, and it won’t run on a PS4 without modification.
Two developments could change the landscape: ps3 to ps4 pkg install
Open the GoldHEN menu and select the Package Installer to see and install files from your USB. Comparison of Methods PS Plus Premium Linux/RPCS3 Method Ease of Use Stability High (Streaming) Low (Bugs/Lag) Legality Homebrew/Risk of Ban Downloadable? No (Stream only) Yes (Local) Summary of Common Questions Hacking My PS4 To Play PS3 Games Was An AWFUL Idea The PS4’s operating system and hardware architecture are
A PKG (Package) file is Sony’s proprietary installation format for firmware updates, themes, and games. On both PS3 and PS4, when you install a game from the PlayStation Store, you are installing a PKG file. Homebrew developers have learned to create custom PKG files that can be signed and installed on modified consoles. Comparison of Methods PS Plus Premium Linux/RPCS3 Method