Did Shang Dynasty predate Xia Dynasty?

No, the order of the 5 main dynasty's was1.) Xia Dynasty2.) Snag Dynasty3.) Chou or Zhou Dynasty4.) Ch'in or Qin Dynasty5.) Han Dynasty

they are dynasty

They were both Black dynasties that were part of the great African rice culture that swept through Asia.

NOT true. The Shang Dynasty (1600-1046 BC) came immediately after the Xia Dynasty.

The major difference is by sues