Are there any differences between nvidia-graphics-drivers 304.43 from x-swap PPA and x-edgers PPA, or is it the same package?
But, note that the X-Swat PPA contains only graphics driver packages, while the xorg-edgers PPA also contains many other "bleeding-edge" graphics/system packages which may be unstable; if you choose the xorg-edgers PPA, regular updates will install these other packages too.
So, if you want to update only your graphics drivers, the X-Swat (X-Updates) PPA is recommended.
At this moment, x-swat is quite outdated, so I think is better to use xorg-edgers. At least they have a saucy version