Question

What did Maya and the Aztec civilizations have in common

Answer 1

The thing that both of these civilizatons have in common is their agriulture
The mayan and the Aztec were among the first civilizations that create a more advanced irrigation system.
On the ancient sites within these civilizations, archaeologists found several structures that connect the river to an empty land that they believe was used as the space to plant crops

Answer 2

Both cultures had much in common in their religion, as well as in agricultural life.

The Mayan and Aztec civilizations were both polytheistic in their religious beliefs, and both built pyramid-type structures to their gods.  The religious life of their civilizations revolved largely around agricultural fertility and blessing, as both were agricultural societies.  In their religious views, they also both revered the feathered serpent god known to the Aztecs as Quetzalcoatl.  Quetzalcoatl was the Aztec god of wind, air and learning, and was borrowed from prior ancient beliefs of other cultures in the region, like the Mayans.  Also in their religious life, both Mayan and Aztec cultures believed in and practiced human sacrifice.