Marriage customs

Hello,

I have a question about the protocol/customs of the marriage process of Mexico historically.

I have found more that one record for the same marriage in some cases so my first question is did each individual have to register/license in their respective parish and civilly or am I misunderstanding?

Also is the "informacion matrimonial" part of the licensing process? dispensa? I have this record from the "informacion matrimonial" and although I cannot translate the entire document yet before I spend hour on deciphering its content I thought to ask is it worth the trouble? will this document contain any family information other than parents names?

https://familysearch.org/pal:/MM9.3.1/TH-1-18572-589-41?cc=1874591&wc=12507168

Thanks, as always, for your help in advance.

Best regards,
Monica Ochoa