You Do Need power plug adapter while traveling from Namibia to Senegal.

Here is Why You Need An Adapter

The outlet and plug type used in Senegal are C, D, E and K and in Namibia are D and M. This is how they look like.

Namibia

In Namibia, outlets of type D and M are in use.

Type D

Type M

Senegal

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

Type C

Type D

Type E

Type K