You Do Need power plug adapter while traveling from Pitcairn Islands to Abu Dhabi.

Here is Why You Need An Adapter

The outlet and plug type used in Abu Dhabi is G and in Pitcairn Islands is I. This is how they look like.

Pitcairn Islands

In Pitcairn Islands, outlets of type I are in use.

Type I

Abu Dhabi

In Abu Dhabi, outlets of type G are in use.

Type G