The Charles Higgins b.1866 Pylle is a different person entirely. This one was the illegitimate son of a Jane Higgins who later married a Joseph Ashford and it is this man who was in the army - his mother and stepfather listed on his service papers. On 1871 census he is listed as 'Charles P' (although birth entry as plain Charles) and was clearly another Charles Paul Higgins - he married an Irish lady named Amy and he is the Charles Paul Higgins buried 22/7/1910 Pylle. Census the following year shows Amy as a widow.
So, son of George and Charlotte (nee Ring), was registered at birth as plain Charles in Dec.qtr.1863, baptised as Charles Paul together with his sister Bessie in 1866, and vanishes between 1881 and 1891 census.
Bessie Higgins was registered in June quarter 1865 (mmn Ring). Having read your previous thread on this family you say that Bessie was your gt. grandmother but she didn't marry until 1914 when she was 49 (having previously lived at home until then) so wondering how she was your gt. grandmother (unless she'd had an illegitimate child at some point who hadn't lived with her).
Annette