They appear to be the same because they almost are. Remember this is a proprietary driver, so the differences are not in the text files which are all the same and basically there for compilation, but the difference appears to be in the binary file, as one would expect with a non-source based driver.
Besides, to put it bluntly "it works." I learned through 1 week of headbanging. You can feel free to do the same if you wish
I shoudl also add that optimization=1 is a cop-out considering that its also available in the 256 drivers. Which kernel are you running, RH8 or RH9, or what? I thought 256 would not compile under RH9 anyway.