also, bear in mind that although a person is present at their own birth, they usually are not actually able to bear witness to the exact day and place. If you are ruling out candidates on the basis of their DoB not being an exact match in every regard to the DoB stated almost 30 years later by someone who didn't have useful first hand knowledge (that is to say, the baby himself, now the bridegroom), maybe take a second look.
There are lots of records where people have their correct birthdays, but the year is one or two years off, for a variety of reasons, not all of them meant to deceive.
There are also some records where people mis-remembered their actual birthday, but got the month right according to the registration docs
There are also registration docs where the family might have mis-stated the birthday as something later in order to avoid a fine for not doing the registration within the allotted time frame...
I find that I have to look at the whole picture of the family, and not be limited to whether the date of birth quoted a few decades later is exactly the same as a registration.
Cheers
Shirlea