You Do Need power plug adapter while traveling from Bolivia to Congo.

Here is Why You Need An Adapter

The outlet and plug type used in Congo are C, D and E and in Bolivia are A and C. This is how they look like.

Bolivia

In Bolivia, outlets of type A and C are in use.

Type A

Type C

Congo

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

Type C

Type D

Type E