I must first admit that I have not used Cor-Bons in either my PPK or my PPK/s, so I'm at a loss to answer directly your question. However, I will second the advice to put several boxes through your handgun before you stake your defense on it.
In my small Walthers, I've been using the Fiocchi ammo. The SJHP works best in the PPK, and the FMJ works best in the PPK/s.
YMMV, of course.
Ken Strayhorn
Hillsborough NC