Brahmos incorporates a lot of new technologies compared to Yakhont,which it is based on..
Even according to the official brahmos website..
Ship-launched BRAHMOS can fly in sea-skimming mode, completely destroy target :: BrahMos.com
As per analysis brahmos is based on yakhont but with new technology the same way CM-400 may be based on kh-15 but with new seeker,frame and new rocket motor with gps for mid course correction