You Do Need power plug adapter while traveling from Vatican City 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 Vatican City are C, F and L. This is how they look like.

Vatican City

In Vatican City, outlets of type C, F and L are in use.

Type C

Type F

Type L

New Caledonia

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

Type C

Type F