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In the reef guides there is described as Ceroderma anceps. however, I don´t find this same ID online. It is indeed an holothuria and seems to me like a type of sea apple (sea cuccumber of the Paracucumaria family). I am not sure the second picture is the same species but they looked alike.
Coral reef and sandy sea bottom areas. Pictures taken in Koh Koun and Koh Rong.