The most likely man is Albert Harper Smith , a Skipper in RNR. Appointed 12 Apr 1915 on the Daimler. Born 30 Jun 1878 in Gillingham Norfolk. There is a seaman's card with photo. But without any more information, I cannot be certain
The Auxiliary is a Lt in RNR
1878 Jun 30 Born Gillingham , as Albert Harper
1901 Jul 26 married Celia Spindler in Norfolk
1911 census On a fishing boat in Padstow, Cornwall. He is now Harper Smith
1915 Apr 12. Appointed Skipper in RNR on Daimler
1919 Gets a Seaman's Card
1921 Oct 31. Accepted in England Joined ADRIC with service no 2150. Posted to Depot.
1921 Dec 7. Appointed A/CQM
1921 Dec 19. Relinquishes appointment of A/CQM
1921 Dec 31. He get a new seaman's card
1922 Jan. He appears to have still been serving at the demobilisation of ADRIC
1939 Register He is an unemployed deck trawler fisherman living in Lowestoft with wife Celia
1963 Apr/Sep died Lothingland Suffolk