El Pescado
Member
You need either a euro rgb scart cable with a scart to jpn 21 pin converter, or a jpn 21 pin cable for your console. Just getting a jpn 21 pin cable is probably your best bet.
Either way, you don't want Gamecube component cables for a SNES. They're designed to work with the Gamecube, and that's it; the connector doesn't fit in any other console. Besides, the chip for converting the signal to the appropriate output format is directly on the cable, so it'd probably be confused with whatever the other consoles put out.
(Also, there really isn't such a thing as Gamecube RGB cables; the only ones I know of are component cables that were modded to output RGB instead of YPbPr. Not sure why you'd bother, but evidently somebody out there did.)
So just a straight up Japanese Nintendo branded RGB cable and I'll be fine then?