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USD versus HKD in regards to AML, KYC and so on

Of course not 100% sure here (as this depends on a million factors so to say), but what is your home currency so to speak?
Say you are an American and you suddenly receive $10k worth of HKD, that might raise some additional suspicion (and vice versa if you are from Hong Kong and suddenly receive dollars).
But in reality, it shouldn't matter. The only thing that matters for a bank is whether or not the transaction itself is 'sketchy'. And they have tons of ways to figure that out nowadays.