One of them was updated and brought over on PSP. They're actually both updated and on PSP but only one got localized. So there's that. If you like the first one, you can play a better version of the second one. There's a group trying to translate the updated first one, but I doubt they're very far. They only started like mid last year. Though on that note, it was the exact opposite for the PS1 release. The second one got fan-translated. So you can play both of those in the same style on emulator if you want. Or if you have a hacked PSP it can play them. But nothing wrong with an emulator in cases like this