Grr, sods! Some might think that not an issue, since you don't change graphic cards that much, usually. But you may if you test people's machines. And the same issue bites you if you try to go back to the open source nv driver to get around something you can't get to work with the nvidia driver (I experienced that, myself).
This is the worst thing about the official nivida installer, and why I will never use it.
The livna rpms work around this and install the nvidia opengl libs in such a way that it doesn't conflict with the default ones, but exist side by side.
At a later date you can just remove the rpm and end up back where you start, with a work nv driver.
Chris