Does 24 hour Transit Visa Include change of Airports in same city in China?

Ddon't worry! Your case is eligible for the 24h free-visa transit. Just present the boarding pass or booking proof of the onward flight at the immigration counter, and things will be easy to handle. As the two airports are a little far apart, you'd better hurry up! Either shuttle bus line 1 or subway line 2 (or Maglev+line 2) can be your option!