Probably not only as good, but better. The extra $10 is for the Nintendo brand name and logo. It's like how you can buy Bayer asprin in bottles of 100 for about $5, or you can buy generic asprin in bottles of 100 for maybe a dollar. Just like the generic asprin, it was probably made in the same plant as the Bayer asprin. One batch may get put into the generic bottles, another batch into the Bayer bottles. Same deal with the cables. Odds are, they're all made by the same company, only one batch will get put into the box with the Nintendo label on it, and sold for $35, and another batch will be put into the React box and sold for $25.
I saw the React brand made component cables made for Wii. They run for $24.99. but the Nintendo ones run for $34.99. Are the React made ones as good as the Nintendo made component cables?