The servo code didn't work

Other Hardware Motors, Mechanics, Power and CNC
13

I found this code works:

            DDRB |= (1 << DDB1)|(1 << DDB2);
            // PB1 and PB2 is now an output

            ICR1 = 0xFFFF;
            // set TOP to 16bit

            OCR1A = 0x3FFF;
            // set PWM for 25% duty cycle @ 16bit

            OCR1B = 0xBFFF;
            // set PWM for 75% duty cycle @ 16bit

            TCCR1A |= (1 << COM1A1)|(1 << COM1B1); // |(1 << COM1A0)|(1 << COM1B0); // Add the extra code to make it inverting
            // set none-inverting mode

            TCCR1A |= (1 << WGM11);
            TCCR1B |= (1 << WGM12)|(1 << WGM13);
            // set Fast PWM mode using ICR1 as TOP
            
            TCCR1B |= (1 << CS10);
            // START the timer with no prescaler

            while (1);
            {
                // we have a working Fast PWM
            }

What's the deference between it and my code? I mean the setting pattern are the same.