That mini-boss of sorts was always a painting in Rondo. Never was a playing card...
And yeah, the PSP version appears to be a direct port, except for the already noted title screen and newly-drawn undies on the werewolf. And of course for the English voices and text, AND THE AWFUL AUDIO DELAY DURING CUTSCENES. Also, the original German intro audio is replaced with the remake's, whether you have the language set to English or Japanese, which is totally bogus as I dig the original narrator, despite not understanding what's being said. "In der guten alten Zeit..."
Other than that, it's true to the original. There may be other things different, but I haven't caught on to them yet.