The pictures help. You have two sound ROMS installed--IMG_0048). I assume that's the XL and MP ROMs. Then there's a picture of something that has an IM343 on it. That doesn't look like a P2K sound ROM to me. Is that what you are calling the PE sound ROM? If so, it doesn't look like it would be compatible with other P2K systems. Unfortunately, I do not know much about the PE module. Maybe that's a custom OS/RAM/Sound ROM that works in the PE module and what you need is the World Expedition ROM that works in any P2K module.
I was hoping the PE rom had labels like the other P2K sound roms. Not sure what those numbers your posted indicate.