How to copy graphics driver from Nightly to R1A2?

I'm running Haiku R1A2 on a Dell Desktop with a nVidia GeForce 7300 LS gfx card. Although my monitor supports resolutions up to 1920x1080, the best resolution I could get with Haiku was 1650x1050 using the nVidia TNT/GF driver from Haikuware.
Just the other day, I installed haiku-nightly-r39742-x86gcc2hybrid on another partition on the same machine and was surprised (and very pleased) to immediately get a 1920x1080 resolution without having to search around for drivers.
However, as I know that nightlies may not be stable, I wanted to copy whatever is the appropriate graphics driver from the nightly to R1A2 so that I could have the higher resolution in the more stable R1A2.
I've copied all the gxf drivers from /boot/system/add-ons/kernel/drivers/bin on the nightly to the same directory in R1A2. However, this made no difference to the available resolutions.
Any clues where I should be looking?