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

Here is Why You Need An Adapter

The outlet and plug type used in Sudan are C and D 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

Sudan

In Sudan, outlets of type C and D are in use.

Type C

Type D