You Do Need power plug adapter while traveling from Azores to Cuba.

Here is Why You Need An Adapter

The outlet and plug type used in Cuba are A, B, C and L and in Azores are B, C and F. This is how they look like.

Azores

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

Type B

Type C

Type F

Cuba

In Cuba, outlets of type A, B, C and L are in use.

Type A

Type B

Type C

Type L