PWM on Ardino mini

Hi, I have a Arduino Duemilanova with pins 9-10-11 marked PWM I also have a Arduino Mini but pins 9-10-11 are not marked PWM Could this be the reason the Mini doe's not work with the same code as the Arduino Duemilanova?

I'm surprised there's room on a Mini to label anything. There should be no reason the pins are any different to a 2009.