Portal 2 for the PS3 was made by Valve back in April 18th 2011.
The way the engine was ported is so different from The Orange Box version that you might as well call them different engines.
When you rename portal2/zip0.ps3.zip the game will fail to load game assets and display a petscop-like shaking triangle with beveled edges and a low poly red exclamation mark.
Portal 2 has working addons folder support. That means, in theory, you can port SourceMod to the PS3.
This was used to fix the multiplayer cross-play functionality, as it was disabled by Valve from using the normal socket based method.
Here is a guide on how to set up multiplayer for the version.