It isa certainly very likely, as surnames were anglicised either on purpose by the individual or accidentally by the person recording the name, like the enunmeretor or the transcriber. My children's great great grandmother Lucy Miller aka Muller was born in Saxe Coburg , her family's name was changed on the 1881 census. I joined the Anglo-German family history society when I discovered her in 1992 and they were a great help. Can you find any of Charles (Ernest) and Ann';s children using the Treasure surname and the Tresher surname? The Anglo-German FHS would be able to give you info on the suname variations.
http://www.agfhs.org.uk/