Shanghai 72 Hour Visa Free Transit Permit?

I have USA passport. I plan to arrive at Shanghai Pudong International (PVG) airport from USA. I will stay for 72 hours and then depart to Taipei, Taiwan, however my departure will be from Shanghai Hongqiao International Airport (SHA).

To qualify for 72 free transit permit, do I have to arrive and depart from the same Shanghai Airport or can I arrive at Pudong (PVG) and depart from Hongqiao (SHA)?