Yup, can't say for sure, the pictures are not good, but based on the one picture that shows that pattern on the top shell I will agree that is an emerald crab too.
Doesn't look like a green emerald crab (Mithrax sculptus), body shape looks a little too oval. Easy way to tell, check the inside of the elbow joints. If they're red, it's an emerald crab. You can see the body shape and the red elbow spot in this pic.
Maybe do a google search on xanthid or mithrax crabs and see if you find it.
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