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

Here is Why You Need An Adapter

The outlet and plug type used in Åland Islands are C and F 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

Åland Islands

In Åland Islands, outlets of type C and F are in use.

Type C

Type F