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

Here is Why You Need An Adapter

The outlet and plug type used in Namibia are D and M and in Argentina are C and I. This is how they look like.

In Argentina, outlets of type C and I are in use.

Type C

Type I

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

Type D

Type M

I am from

going to