As Wever said, it's best to test these on an ntsc nand. DKCR (ntsc) definitely works on my usa nand, and go vacation probably will work too.With v4RC4 i can't play DKCR (ntsc) (wbfs and fst) and Go Vacation (ntsc) (wbfs and fst) with my (pal) NAND. i didnt tested if it works with a (ntsc) NAND.
Is there a region check in cDI?