Hi Mckha and Rosie,
It is the same man!

The clincher is this page in Wynne's Diary, para 2, where Thurie (Wynnes alias for Arthur) is mentioned recounting stories of his time in Australia and of acclimatisation of annuals and plants there, both of which match what we already know of him. I wonder if he ever talked about his Armed Constabulary service or his less salubrious life events.
https://wynnesdiary.com/1923-september-viewer-5/So now I need to find his death and burial, and maybe a first marriage.
There are a total of thirteen files regarding him sitting at Archives NZ which I'll get in the coming weeks.
I have just emailed the Fiji Times newspaper requesting a search of their archives for the court case and their divorce, as the paper was in print then. I'll keep you posted.
Brilliant work, thanks again.

Spades