Not the technical type myself, but I seem to remember kinetic energy is half the mass times the square of the speed.
In your example, the airbus would have a kinetic energy of
E_kin_Airbus = 0.5 * 51 t * 119 kn ≈ 0.5 * 51000 kg * (61 m/s)^2 ≈ 96 MJ
The Boeing's kinetic energy is
E_kin_Boeing = 0.5 * 60 t * 142 kn ≈ 0.5 * 60000 kg * (73 m/s)^2 ≈ 160 MJ
By my reckoning, the Boeing's kinetic energy is 67 percent higher than the Airbus':
E_kin_Boeing / E_kin_Airbus = 160 MJ / 96 MJ ≈ 1.666
(Glad you just corrected your post, eckhard)