Similarities between the Greek earth mother Gaea and the Mesopotamian earth mother Tiamut?

Gaea is Mother Earth or Mother Nature in Greek mythology.

Gaia in Greek mythology refers to mother earth. In Greek mythology it is believed that Gaia was one of the first to appear along with the air, sea and sky. Therefore she is the great mother of all...

Yes. They have a Mother Earth goddess called Gaia.

Μητέρα Γη [MeetEra ghee]

Gaea