You Do Need power plug adapter while traveling from Norfolk Island to Comoros.

Here is Why You Need An Adapter

The outlet and plug type used in Comoros are C and E and in Norfolk Island is I. This is how they look like.

Norfolk Island

In Norfolk Island, outlets of type I are in use.

Type I

Comoros

In Comoros, outlets of type C and E are in use.

Type C

Type E