In the DCEU, Bruce Wayne is much older and worn down, but still a wealthy socialite and owner of Wayne Enterprises. When he transfoms himself into the Batman look, he is muc more similar to Frank Miller's Dark Knight Returns Batman. The ideal fight between Batman and Superman, in the previous movie, came directly from this comic book.  He dedicates himself to protecting Gotham City from its criminal underworld as a highly trained, masked vigilante equipped with various tools and weapons. In The Snyder Cut, Batman is still very dark and broken, but is on a road of redemption to the orgns of atman and wha Batman actually stands for. 

In this movie, both Batman and Bruce Wayne have a very deep and gravelly voice to them. So, in your audition I want to hear that deep tone and see a difference between the Batman and Bruce Wayne voice. Below  are some reference materials for both the Bruce Wayne and Batman voice. 

All Batman Scenes in The Snyder Cut: https://www.youtube.com/watch?v=E19er3eSa0Q

Bruce Wayne Discussin His Dream: https://www.youtube.com/watch?v=vuTj0yL3CMA