You Do Need power plug adapter while traveling from Vatican City to Equatorial Guinea.

Here is Why You Need An Adapter

The outlet and plug type used in Equatorial Guinea are C and E 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

Equatorial Guinea

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

Type C

Type E