When the Samsung Galaxy S III was first announced for US carriers, the fact that they all had the same specs was a big deal. This meant that, for the most part, ROMs would work on any of the devices with only minor changes that needed to be made. Now, there is a script that will make those changes for you so it’s not tedious getting ROMs on all the devices.
XDA Forum Member cpu999 released the script in the AT&T Galaxy S III forums. The script files include all the proprietary files so that once you run it, you simply select which Galaxy S III you want and the script will inject the proper files.
How it works is pretty simple. You download the ROM you want to port and a base ROM of the same Android version. Extract both ROMs and place the files in the same folder. Then simply run the script. It’s useful for developers who maintain ROMs on all the US Galaxy S III devices, but it is also easy enough to be used by members who just want a ROM from one of the others. Additionally, cpu999 has mentioned that future updates will simply turn any ROM zip into a universal zip for any US Galaxy S III device. It will require AROMA installer, but having one ROM zip to flash for all the US versions would make everyone’s lives easier.
For more details, check out the original thread._________