In just the same way that if the context were "magical space villain in a black mask and cape" and someone was hired with a deep voice, it would be a clear rip-off of James Earl Jones.
And it requires a level of credulity that I find impossible to sustain to think that "the sequence of events" here doesn't start with "let's have a voice actor casting call and pick a voice that sounds like the one in the movie about this that everyone loves". I won't, however, be shocked if nobody ever wrote that down in a medium that is subject to legal discovery.