You Do Need power plug adapter while traveling from Peru 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 Peru are A, B and C. This is how they look like.

Peru

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

Type A

Type B

Type C

Cuba

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

Type A

Type B

Type C

Type L