Can I have the same clothes on me on two job interviews in one company?
I don't see a reason why wearing the same clothes should cause problems.
Dress for the job you want, not the one you have, as the saying goes. If you're going to an interview for a managing, consulting or front-desk job, wear a clean suit and tie (for men). For a desk-job or a job in a less formal setting, wear casual professional. For a job in a startup it may be just as appropriate to wear jeans and a t-shirt.
The most important thing is to wear clean clothes, no matter how professional or casual. If you get a refusal, it's not because you wore the same clothes in several interviews, but for some other reason.