There is a definite, but subtle, difference between the orange and the bronze crystals. The bronze color is a little darker in tone than the orange. If you put an orange-colored lightsaber in one hand and a bronze-colored lightsaber in the other, the orange one will look very bright and vibrant while the bronze one looks more like an orange-brown color. Truthfully, it almost looks like a rust color. This is one of the few ways I know of differentiating the two.
PS. Yes, my TV supports the Green/Blue/Red Component Video inputs and I'm using that instead of the classic Yellow RCA or S-Video inputs. That may be why I'm noticing a difference in the color while those using the S-Video or other input connections are not. Don't worry, either way you aren't missing much. They are too close in color to really care!