Hard to tell exactly what you're asking here, but here are the differences between the Samsung Vibrant and the Galaxy S 4G:
1) it's now a 4G phone (yay!)
2) it now has a front-facing camera (yay!)
3) it now comes with a 16GB SD card (yay! previously came with a 2GB card)
4) it now has 512MB of internal memory (previously 16GB - yes, that's not a typo.)
Item #4 is inexplicable....don't know how they can call this an upgrade. Also, surprising that they didn't improve the 5MP camera or add a flash. Thumbs down on the Samsung Galaxy S 4G!