Intent on whose part, though? Like, supposing in arguendo that the company's goal was to make the voice sound indistinguishable from SJ's in Her, but they wanted to maintain plausible deniability, so instead cast as wide a net as possible during auditions, happened upon an actor who they thought already sounded indistinguishable from SJ without special instruction, and cast that person solely for that reason. That seems as morally dubious to me as achieving the same deliberate outcome by instruction to the performer.