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

Here is Why You Need An Adapter

The outlet and plug type used in Andorra are C and F and in Argentina are C and I. This is how they look like.

Argentina

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

Type C

Type I

Andorra

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

Type C

Type F