You Do Need power plug adapter while traveling from Brazil to New Caledonia.

Here is Why You Need An Adapter

The outlet and plug type used in New Caledonia are C and F and in Brazil are C and N. This is how they look like.

Brazil

In Brazil, outlets of type C and N are in use.

Type C

Type N

New Caledonia

In New Caledonia, outlets of type C and F are in use.

Type C

Type F