I have a 2012 CT200h and I'm about to update the navigation software to the 2018 update. The Lexus dealership says this update cost $330.00. I've been told that the ct200h and the Prius share many parts. Does anyone know if the Prius share the same navigation software as the ct200h? I'm thinking that the Toyota Dealership can do this job for less than the Lexus Dealership. Does anyone have an answer to this question?