Does Anyone Know of a Military Registry (1675 - 1695 era?) of Nueva Galicia?

I am looking for Fernando De La Campa y Cos who supposedly was in Sombrerete, Zacatecas, Mexico in 1693. He was born in Burgos, Spain in 1676.

At 1693 that would make him 17 years old and I haven't ran across any documents to mention him to see what he was doing. I know that his older brother Antonio De La Campa y Cos was a Capitan of the District of Sombrerete in 1675. By 1693, he could have been a General.

I am wondering if Fernando De La Campa y Cos was a soldier in the company of his older Antonio De La Campa y Cos to learn and take over when he got older.

That is why I want to find a registry of the military in the region if Fernando De La Campa y Cos is on that list. My guess he would be under the command of his older brother.