I will land on PVG but leave from HGH.

I am an American and am going to attend an academic conference in Hangzhou.

I will arrive at Shanghai Pudong Airport from Newark, USA (EWR) on Friday noon. Then take a long-distance bus to Hangzhou City. Then attending the conference on Saturday and Sunday. The only place to go is around Hangzhou City and riding a bus from PVG to Hangzhou. On Monday I will take a flight from Hangzhou (HGH) to San Francisco (SFO), not PVG to SFO.

Can I still use the 144hr transit visa, even though leaving from HGH not from PVG?