Its possible to use this conditions for inflight to Shanghai PVG, and outflight from CAN Guangzhou?

Dear, according to what you said, you are not eligible for the 72 hour free transit. But if your total layover time in PRC is less than 24 hours, it’s possible for you to use the 24 hour direct transit. If it’s more than 24 hours, you need to apply for an entry permit ahead of your journey.