You Do Need power plug adapter while traveling from New Zealand to Guyana.

Here is Why You Need An Adapter

The outlet and plug type used in Guyana are A, B, D and G and in New Zealand is I. This is how they look like.

New Zealand

In New Zealand, outlets of type I are in use.

Type I

Guyana

In Guyana, outlets of type A, B, D and G are in use.

Type A

Type B

Type D

Type G