You didn't get a response because stock roms of the same Android version are essentially the same, except for different bloat for different carriers, minor kernel differences and different modems. You don't see major differences until you're talking about different Android versions.
Try them yourself & see if you find any difference.
If it's important enough to cause you grief if it's lost, back it up. No excuses
Trolling for thanks is lame
Does Samsung's auto-brightness implementation crap drive you to self-harm ? A solution !
Failure to search is the leading cause of male impotence on XDA
If you don't know how to recover if things go wrong, what are you doing flashing custom roms ?