Trying to figure out if these 2 people are the same

Can someone help me sort this out ? I'm not sure if these people are the same with different last names. I'm trying to do my family search on one of my last name Flores. The person in question is Simon Flores who married Maria del Carmen Lomeli in the 1830's in jalisco. I have yet to find their wedding document. I'm a related to their son Calletano Flores born in the 1840's. I have yet to find his birth doc too.I know that it was in the 1840's because I did find Calletano's wedding doc. 2 of Calletano's sisters were born in tecolotlan. They are Francisca Flores, born Jan 28th 1853. And Donaciana Flores born Sept 5 1858. Based on their baptism documents. the grandparents were Jose Maria Flores and Benita Salazar. I came across a wedding document for a Simon Becerra married to Maria del Carmen Lomeli on Jun 14 1837 in Tecolotlan. Simon Becerra parents in the document are Jose Maria Becerra and Benita Salazar. Can they be the same person ?And why would they change the last name ? I also found that Simon Becerra and Maria del Carmen Lomeli did baptise other children with the Becerra last name. Can someone point me in the right direction ? PLEASE!