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You're probably the better judge of what you have, well... since you have it... but Pseudosiderastrea seems more colonial to me. It's a colony of polyps that share the walls of their skeleton. Your pictures seem to be a group of individual polyps - each one its own thing.
The coral I noted is part of the Caryophyllidae Family. Another related to that is Caryophyllia... you might Google Image that name and I think you'll find a bunch similiar to your pictures. There's also Phyllangia... but that appears to be an Atlantic species and not a Pacific. I'm assuming your rock came from the South Pacific?
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