This report describes the results of a pneumatic pressure standards key comparison among nine SIM National Metrology Institutes in order to determine their degree of equivalence in the pressure range from 10 kPa to 120 kPa in gauge mode. The pilot laboratory was the Centro Nacional de Metrología (CENAM, Mexico). All participating institutes used pneumatic pressure balances as their pressure standard. The transfer standard was a complete system including a pressure balance with a free-deformational pistoncylinder assembly and a set of masses. Eleven participants completed their measurements, although, only nine laboratories reported the pressure-dependent effective areas of the transfer standard at specified pressures with the associated uncertainties. NRC/Canada and BSJ/Jamaica withdrew the comparison by not sending their measurements. The results of the eight laboratories that sent their results were linked to the CCM.P-K6 comparison through the reference values provided by NIST, USA. The degrees of equivalence were evaluated by the relative deviations of the participants' results from those obtained by NIST. The results of six participating NMIs agree with the NIST reference values within their expanded ncertainties (k=2) in the entire pressure range from 10 kPa to 120.