Juan de Tiscareño y su esposa Ýsabel Romo de Vibar y Rangel

I have a friend's genealogy well-documented from online images of the original registers (from FamilySearch) through Ýsabel de Tiscareño Romo de Vibar (bau. 04 de agosto de 1675), "... hija legitima de el Capitán Juan de Tiscareño y Dª Ýsabel Romo de Vivar ...". Does anyone have proof that this Juan de Tiscareño is the same person who was baptised in Aguas Calientes el 12 de nobiembre de 1638, "... Juº hijo legitimo de Luís de los Reyes y Juª de Vargas ..."? Also, does anyone have proof of the birth (baptism) of the Ýsabel Romo de Vivar mentioned above? Ýsabel was buried "... en la Yglesia de San Diego ..." (en Aguas Calientes) el 15 de junio de 1692 "... mujer de Juan Tiscareño ...".

I have documented nine children of this couple in Aguascalientes between about 1558 (Margarita) and about 1678 (Nicolás)—I have located baptismal records of six of the nine—and I am reasonably confident about two- to three generations beyond Ýsabel, but I lack proof that her husband, Juan de Tiscareño, is the same person named in the 1638 baptism.

Everything quoted is from one or more of the online images of the original parish registers. Any insight will be greatly appreciated.

Sincerely, and with best wishes,
Lawrence Bouett