There are many, many inconsistencies.
However, the facts that tie them into being the same man are as follows
1) Enlistment 13 Sep 1906. Alfred Ward, dob 28 Dec 1888, born Highbury, London. Next of kin Sister Nellie Ward
2) Enlistment 19 Mar 1915. Alfred Ward, dob 29 Dec 1888 (1889 crossed through), born Highbury, London. Next of kin Nellie Varney, Address Police Station
3) Documents in cousin's possession name Harry and Nellie Varney named as relatives
4) Marriage 5 Sep 1925 states mother was Mary Ann Maryon
Eleanor Elizabeth Ward was born 9 Dec 1881, Bethnal Green, GRO MMN Myron
Harry Alfred Varney, Police Sergeant, married Eleanor Elizabeth Ward 27 Jul 1908
He has sent letters and telegrams which were sent to his grandmother Mrs E A Ward at Port Macquarie, when Steven Claude Ward went missing, then reported prisoner of war in Stalag, Germany, as per newspaper report.
He has a telegram from Bert Hinckley/Hinkley, mentioned in the newspaper report.
Bert Hinkley was based in same squadron as Alfred Ward, according to newspaper report and military records.
Where Parry Sound, Ontario, Canada fits in I'm not sure!! But they are one and the same person.
He also sent Stephen Claude Ward birth cert - 23 Mar 1920, Queen Charlotte Hospital, St Marylebone, Father Alfred Ward, Mother Ure Beatrice Ward, formerly Holden.
Regards Margaret