I am currently a college student and I am scheduled to graduate this summer. For the last two and a half years I have been working for a research facility on campus. During that time the facility has changed hands. I have worked with the assistant curator for the whole time so I asked him for a reference. However, I would also like a reference letter from the previous curator with whom I worked for two years. Would it be overkill to have both reference letters from the same job?