You Do Need power plug adapter while traveling from Lesotho to Ethiopia.

Here is Why You Need An Adapter

The outlet and plug type used in Ethiopia are C, F and G and in Lesotho is M. This is how they look like.

Lesotho

In Lesotho, outlets of type M are in use.

Type M

Ethiopia

In Ethiopia, outlets of type C, F and G are in use.

Type C

Type F

Type G