Allred-Rochow vs Pauling Electronegativity scale
Pauling's electronegativity scale is determined by considering the strengths of A-A, A-B, B-B bonds.

Allred-Rochow's electronegativity is determined by considering the charge experienced by an electron on the "surface" of the atom.

While the correlation between the two scales is not perfect, it is quite good, since the scales are calculated with different methods:




  The correlation between Allred–Rochow electronegativities (x-axis, in &Aring;−2) and Pauling electronegativities (y-axis).
  By Physchim62 GFDL, CC-BY-SA-3.0, from Wikimedia Commons


Also the partial charge is a model, useful in order to make rapid evaluations on real things. Sometimes, when molecules with almost covalent bonds (such as nitrogen trichloride) are modeled with different electronegativity scales, the partial charge may be different, but the actual electron cloud may not agree with the model.

The real electron density can be then calculated with quantomechanical methods, which are much more accurate and yet complicated than the simple model of electronegativity.