confused who is correct name for grandparent back then ?

ancestry.com lists my 7th great grandparents names as antonio posada and maria quiros. however in family search area they lists for hints as a antonio pacheco and maria quiros. hints are located for area of morela, guanajuato, mexico. the child is my 6th great grandparent known as maria manuela posada who had married josef martin guillermo. or did maria quiros my 7th great grandma also marries a man named antonio pacheco afterwards?