Answer:
They both had pyramids.
Why are Maya pyramids so similar to Egyptian pyramids?
Because there are numerous pyramids and pyramidal constructions that are superficially identical around the world. The pyramidal form is a great technique to construct a tall but sturdy building. To assume that distinct cultures could not have separately developed such forms is to undervalue the ingenuity and originality of ancient civilizations.
Pyramids from Egypt and the Maya are superficially similar. One may clearly detect variations between them if they examine each one's genesis and construction history.
Additionally, the Mayan pyramids were not the first in the Americas. Much earlier pyramids may be found in South America, specifically Peru. For instance, those at Caral are as old as the first pyramids in Egypt. If Mesoamerican cultures were inspired by anything, it would make more sense for them to have drawn their influence from South America rather for Egypt. They are presumably a unique innovation, although we have no actual confirmation of even that.
In Mesoamerica, pyramids were erected by the Olmces before the Mayans even arrived. Pyramids can also be seen at Teotihuacan, an ancient metropolis.
All serious archaeological investigations show that the American pyramids were invented totally independently from Egypt or any other Old World civilisations. Pyramids are prime examples of how different cultures in different places and during different times can invent structures that remind of each other, but still have their own unique traits.