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

Here is Why You Need An Adapter

The outlet and plug type used in Mozambique are C, F and M and in Equatorial Guinea are C and E. This is how they look like.

Equatorial Guinea

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

Type C

Type E

Mozambique

In Mozambique, outlets of type C, F and M are in use.

Type C

Type F

Type M