Kremlin as government analogy

I am not an expert but it seems that the use of Kremlin to reference the government has different meanings in Soviet and modern Russia.  The way I interpret things, in Soviet times Kremlin references all branches of the government while in modern times it references only the presidential branch.  Given that distinction there would be two analogies to point out, the Soviet era analogy, Kremlin == Washington (and British equivalent) and the modern era analogy, Kremlin == White House, Downing Street.  Can anyone confirm, deny or modify this interpretation?