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They are indeed very similar, the main difference would be in their syntax:
e.g. SELECT * FROM Database WHERE Fruit IN ('Apple', 'Orange', 'Banana');
e.g. keep row: IN(brand, ['discount','mid','high-end'] )
derive value:IN(column_string, values_array)
More info on this page:
https://docs.trifacta.com/display/PE/IN+Function