Obviously, diatonic harmonica requires bending a note to get a chromatic scale.
Chromatic harmonica (16-hole like Hohner 64) can get a full chromatic scale by pressing or releasing the side button.
According to Anthony Labarre on Chromatic harmonica: Bending offers a smooth transition from one note to the other, which you cannot obtain if you only use the "button" -- if this means anything to you, it's the same difference between bending a note on the guitar and moving your finger to play both notes one after the other.
The bending note chart for the diatonic harmonica is well known see Diatonic harmonica: How to play the draw bend with the three semitones down (effectively)?
What is the bending note chart for the chromatic harmonica?
Are the bending techniques in 16-hole Chromatica (like Hohner 64) similar or different from those of the diatonic harmonica?