Since the chipset is not exactly the same, there is a small chance that it won't work, or more worrisome, that it'll seem to work, but will result in some data corruption. Remember that the "drivers" you install are often designed to work with multiple chipset variants; that doesn't necessarily mean the same part of the driver code will be running with each different chipset. I'd try it, but would certainly back up beforehand. You might also try contacting Silicon Image.