Sounds like wishes from fans rather than truth. I doubt this rumor has any basis in reality.
Wouldn't be surprised if a game or two was translated by a developer and published though. Sony, no doubt, could care less if a PSOne release going up on PSN was never before released in the states.
There shouldn't be, they're just disc images running in the same emulator disc do.
But there does seem to be the occasional differences, Silent Hill for example has supposedly been reworked a bit to resolve some issues the game had when the disc was running in Sony's PSOne emulator.