stress converges slowly with cutoff and if you are not at full convergence setting the variables qcutz=150., q2sigma=2.0, ecfixed=24.0, modifies the kinetic energy of the electrons beyond 24 ry adding a large penalty function and the "effective" cutoff of your calculation is something around 24 ry. This affects the total energy and the stress. Also having smearing instead of fixed occupation makes a difference but if your system is gapped it should not be large. In order to compare output of the two codes you should use the same setting in both.
stefano CP> > &SYSTEM > ibrav = 14, > celldm(1) = 24.4946, > celldm(2) = 1.0,celldm(3) = 1.0,celldm(4) = 0.0,celldm(5) = > 0.0,celldm(6) = 0.0, > nat = 64, > ntyp = 2, > nbnd=288,nelec=576,nspin=1, > ecutwfc = 30.0 , > ecutrho = 240 , > occupations = 'fixed' , > xc_type = 'PBE', > > qcutz=150., q2sigma=2.0, ecfixed=24.0, > / > PW> > &SYSTEM > ibrav = 1, > celldm(1) = 24.4946, > nat = 64, > ntyp = 2, > ecutwfc = 30.0 , > ecutrho = 240 , > occupations = 'smearing' , > degauss = 0.02 , > smearing = 'fermi-dirac' , > / > &ELECTRONS > >
