I have a pair of Sabogaes. They are my absolute favorite boas. From what I have read, "Pearl Island" is just another name for Sabogae boas They actually come from the Island Sabogae, but people have coined the name Pearl Island instead. I bought them from Jeff Carr of West Coast Constrictor. They came with Cites paperwork that proves they are from Sabogae. Here is an old picture of the male. I will have to post a more recent picture soon.
Edit - After doing some reading, I realized the Pearl Islands is a group of Islands off the coast of Panama. Sabogae is one of the Islands. However, all of the boas imported from these Islands are called Boa constrictor sabogae.