Thanks very much for all of your replies and help! You have certainly cast some doubt. I also wondered about the ears but thought that perhaps there was a lobe hiding (being slightly obscured by the jawline) on the left hand ear (as you are looking at it) of the older man. There seems to be a lobe on the right hand ear (again as you are looking at it) of the older man (i.e. more of a lobe than is visible on the right hand ear of the younger chap). I just wonder if the angle of the head might be changing what is visible of the lobes (
). We don't get such a clear view of the older man's ears as we do of the younger mans ear (left had side as you are looking at it). With regards the parting, I would also have thought men would have stuck with one particular side but this has proved to be incorrect when looking through known family photos of mine (my own great grandfather had a parting on one side into his early twenties and then changed it to the other side in slightly later photos). And I wondered if the expression might be changing the appearance of the eyes\eyebrows (
). The photo of the older man came down to us from my great grandfather so I am sure there is a link to him - I just wish I knew for certain who it was!
I'll keep researching this and am trying to get in touch with the younger man's descendants. With any luck, they may have more photos of him.
Thanks again for the helpful replies!