Almost everywhere equal plurisubharminic functions

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I just have a simple question that if two plurisubharminic functions take the same values almost everywhere, can one conclude that they are the same function? If not, could anyone provide a counterexample?

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Yes. This is mentioned in the book Methods of the Theory of Functions of Many Complex Variables by V.S. Vladimirov at the end of section $9.8$.

A short way to prove it is to use the fact that for a function $u$ with a well-defined Hessian in the sense of distributions, such that the said Hessian is positive semi-definite, there is a unique pluri-subharmonic function that coincides with $u$ almost everywhere.