GameCube RGB vs GameCube on Wii RGB video output

Does someone knows if both console output the same quality or not? (both using the RGB official cable)
I didn't find anywhere a side by side video or pictures about this.

Thanks!

 

GC > Wii > WiiU
There's a video explaining this. I think from Digital Foundry or My Life in Gaming.

 

I don't find such articles or videos .
The only article is about GC Component vs Wii Component: https://www.retrorgb.com/gamecubevswii.html