Which is why you have a styleguide. Open your browser, open your well crafted styleguide. Here is what our "Button" looks like, here is it again when its got "B

Which is why you have a styleguide. Open your browser, open your well crafted styleguide. Here is what our "Button" looks like, here is it again when its got "Button_Primary" on it. Do you need a new type of Button? Author it in the styleguide... now go use it everywhere and be happy. I might be wrong, but in my experience a separation of concerns is the only way a large project stays healthy.