I know Nate at UBG does Bersa holsters.
As for the questions, the slide dimensions aren't quite the same on the PPK and the Bersa, IIRC the Bersa is a little larger and slightly thicker, and the trigger guards are different.
For question 2. It will be the same as all that changed was the front strap.
What do you prefer for IWB, leather or Kydex?
ETA: According to Galco's website, the standard Bersa .380 and the Plus model take the same holster.