Are you serious ? Everyone knows that. Even Miyamoto said it:
"‘The hardware is basically a GC. We’ve upgraded our development tools to new versions but, you can still use GC programs as they are. With that in mind, I thought we could remake GC titles for the Wii and modify them to work with the Wii remote so that they’re more fun to play.’
The Wii was it's own console because of it's controller. If the PS4 is different from PS3 because of more powerful hardware, the Wii is different from GC due to the controller. And DS is certainly not GBA. And the Wii U internally was very different from Wii.
Just a guy who doesn't want to be bored. Also