The differences between the two types derived chiefly from use of the heavier and longer (two rows of seven cylinders) Gnome-Rhône engine. To maintain the centre of gravity the fuselage was lengthened by adding one central section which moved the bombardier's gondola rearwards. The new engine improved performance considerably, for example increasing maximum speed from 319 km/h to 365 km/h. In addition, armament was increased with two forward firing wz. 36 machine guns mounted in offset fairings to clear the radial engine. Up to 700 kg of bombs could be carried under the wings, like the PZL.23. A common option was 24 x 12.5 kg bombs (300 kg in total). A camera was fitted.