Here is a picture of the Samuel James Rawkins with wife Sarah and their youngest dau. Minnie born c.1878.
See if you think there is any likeness to the photo of the man with the Inkerman whistle and chain.
I had presumed they were the same individual, but I suppose they could be father and son. The father (Samuel Rawkins) died in 1869 age 63 (as per FreeBMD).
The son (Samuel James Rawkins) died age 79 in 1913.
Many thanks for your help.