Ah, then as Stryder said, if the same in different hilt looks different it could be the wiring diameter, it could be the settings in the sound card or if it's a different sound card it could be that too. If one has power wired through the soundcard and the other is directly to the battery for power that could do it.

If it's the different blades look different in the same hilt than it could be the type and/or thickness of diffusion, the type of strips, or just a different batch of LEDs really.