the wii virtual console makes use of the wii portion of the console, yes. if you have cbhc, then you're ready to install the wii game. it should install and work without issue.
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the only difference I know of between injecting the game yourself and an official version is that you can change the btsnd (boot sound) to that of the actual wii game's with injecting them. I did that for new super mario bros. wii, but not for dkc returns.
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you can change the banner as well, but I see no reason to on an official game or if the game were missing one.