Such a situation strains credulity. Voice acting is a profession, and professionals by their nature are aware of the wider industry, including the competition. SJ was the world’s highest paid actress in 2018-2019. The film Her was nominated for 5 Academy Awards, including Best Picture, and won Best Original Screenplay.

Even if this did go down the way you suppose, once they realized the obvious similarities, the ethical thing to do was to not use the voice. It doesn’t matter if the intention was pure. It doesn’t matter if it was an accident.