it depends on what you pay for. an sm74 has all the bells and whistles. the pm74 can have all the bell and whistles, but the basic machine comes with manual plate clamping, manual ink levers, manual pressure setting, no console. not sure on the blanket washers. a pm can only be 1 to 4 colors I believe. an sm can be 1-12 colors. sm goes 15000iph the pm is only 13000iph