You Do Need power plug adapter while traveling from Puerto Rico to Guadeloupe.

Here is Why You Need An Adapter

The outlet and plug type used in Guadeloupe are C and E and in Puerto Rico are A and B. This is how they look like.

Puerto Rico

In Puerto Rico, outlets of type A and B are in use.

Type A

Type B

Guadeloupe

In Guadeloupe, outlets of type C and E are in use.

Type C

Type E