Marian Granovsky - Marian Granovsky or Mary Granovsky

The 1931 Census lists MARIAN GRANOVSKY as the wife of Hiram Granovsky (https://www.geni.com/documents/view?doc_id=6000000201988535822) at line 47 on the page, age 31 implying DOB in 1900 or 1901. Other sources list Mary Granovsky as the spouse of Hiram, born 5 years earlier (1896-10-16), especially Findagrave (https://www.findagrave.com/memorial/124693146/mary-granovsky). It is unclear whether those are the same person, or did Hiram have two wives at different times, one Mary born in 1896 and one Marian born in 1900-01.