This is a difficult question to answer only because of the complexity CPF. In a short answer, there are FBAR and 8938 reporting requirements because there is a financial component to the fund. Also Social Security is a defined benefit; CPF ROI (Distributions) will vary based on investment type and value of the fund so it differs slightly from the definition of social security versus an investment even if these are combined together. In short, a CPF has a FATCA reporting requirement because it is an investment as well as a retirement fund.
To provide this answer, I researched several sources but this unofficial source supplies the most complete answer that is available regarding CPF.
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