possible.....yes, practical no. simply because the developers that use these phone usually want to strip the "junk" out of the OS because it slows down the phone.
i have flashed ported touchwiz apps (s memo, calendar, launcher, s voice and maybe some others....been a while) on my galaxy nexus. they were cool for about....1 second. then i realized there were bugs and there were apps on the play store that would do the same thing with none of the bugs.