How is Mexican paste different from gumpaste?

Mexican paste and gumpaste are not the same thing.

Mexican paste is made with a combination of masa harina, water, salt, and lime. It is used to make tortillas and other traditional Mexican dishes.

Gumpaste, on the other hand, is a sugar-based modeling and decorating material used to create detailed decorations for cakes and pastries. It is typically made with a mixture of powdered sugar, corn syrup, water, gelatin, and gum tragacanth.