One is "hearing". The other one is "thinking". Listen to this sound: http://soundbible.com/889-Noise.htmlHow are they? Can you explain this please. Because I experience them as the same. They both arrive and from where they come, I don't know.Can you realize that the actual experience of hearing and the attached thoughts that arise are different experiences?
What kind of sound is this?
Is it coming from more than one source?
Watch, how ideas or images arise that fit/explain/complement the sound.
Can you see how there is the bare experience of hearing, and at the same time thinking is happening, trying to label the experience?

