For many individuals, records will not provide information that matches 100%. Census records on the same individual will provide slightly different ages or places of birth. Death certificates may provide details that do not agree with other records.
Generally speaking, the genealogist has to be content with relative consistency of information–not that it matches completely. Two different census enumerations for the same person should provide enough consistent items that the researcher is fairly certain that the same person has been located, even if some details differ.
There simply is not 100% consistency in genealogical research.
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