Mejia/Castaneda, Jerez Zacatecas Mexico

Is anyone working on the Joaquin Mejia/Ma. Cayetana Castaneda line in the district of Jerez Zacatecas?
My question is if Esteban and Sebastian are the same person. In doing the marriage dispensations from la Sagrada Mitra on the pilot program I keep finding them listed as the same person..
Esteban sometimes referrred to as Sebastian was married to Petra Tovar and their children are from 1769 to 1780.

Sebastian Mejia was married to Juana de Jesus Caldera. All their children are born from 1790 to 1820

Linda in Marietta