Answered my own question!... It's quite confusing but I guess the select pairs are better than bonded pairs since they've known each other for longer? Select Pairs are like highschool sweethearts, while bonded pairs are fish paired up after arriving in concentration camp lol.
From LiveAquaria:
Thank you for your email. Fish labeled as "bonded pairs" have been paired up at our Aquaculture Coral & Marine Life Facility, while those labeled as "select pairs" were kept together at the ORA facility before being moved to our own facility for retail sale. Any time our Diver's Den offers clownfish that were either collected from the wild together or observed spawning together in tanks, they will be listed as "mated pair."