Root cause of sound effect difference between rfxgen and sfxr?

I spent some time comparing sfxr and rfxgen sound parameters and they seem to be exactly the same. In the application the sliders appear in the correct position as well. This is not related to loading or saving either. So if it's not the parameters or loading being incorrect then what causes the laser and hit sounds to be very different? The other ones work the same so it's really strange to me.