They can, but they are mostly the same. I know the Blaze and the Nintendo cables look exactly the same. My inlaws have the blaze ones with the same tv as me and I have the nintendo ones and I see no difference. I'm sure their are some crappy ones out there and some slightly better ones though.
For the Wii, if they make any difference at all it is a very small one. Since the Wii only does 480p to begin with it is a waste of money to buy the more expensive ones. Don't spend any more than $20 on your cables and you will be just fine.
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