You Do Need power plug adapter while traveling from South Sudan to East Timor (Timor-Leste).

Here is Why You Need An Adapter

The outlet and plug type used in East Timor (Timor-Leste) are C, E, F and I and in South Sudan are C and D. This is how they look like.

South Sudan

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

Type C

Type D

East Timor (Timor-Leste)

In East Timor (Timor-Leste), outlets of type C, E, F and I are in use.

Type C

Type E

Type F

Type I