A quick read of the CAAC regs will show that anyone that sits in the left seat whether they are PIC, P2 or Cruise captain must be fully qualified as a capt and receive the same training. That will allow you to log PIC time. The only question is whether you can log PIC time when P2 and didn't command the aircraft for takeoff and landing. That is not addressed in the regs so ask the airline when you get there what their policy is.