Installation of Drivers

What is the difference between the “Developer Driver for Linux (260.19.26)”, (named devdriver_3.2_linux_64_260.19.26.run) and the

“Linux x64 (AMD64/EM64T) Display Driver”, named (NVIDIA-Linux-x86_64-260.19.44.run which can be downloaded from http://www.nvidia.com/Download/index.aspx?lang=en-us).

I don’t know if I need to install both of them or just one.

Edit: Just found the answer here: http://forums.nvidia.com/index.php?showtopic=192331