Yes that would seem to be the most likely marriage but it has Samuels Father as John not Peter on Cornwall OPC!
To be sure you need to buy Elizabeths Birth Cert which will have her mothers maiden name on it.
Do you have her NZ Death Cert?
It should name both of her Parents if they were known to the informant.
Do you have Elizabeth and Henrys marriage Cert?
The NZ ITM is another way of confirming her Fathers name and occp.
Trish
