Wow I hate to say it, but they really look alike
Some people seem to have a really hard time telling art style and actual graphical fidelity apart.
Yes, the ART STYLE (IE the same basic bright, cartoon Mario look) is similar.
But the actual graphics are far better, and trying to argue that is about as absurd as trying to argue that CoD on Wii looks the same as CoD on PS3.
The actual polygonal structures, the textures, the lighting, the particle effects, the animations, you name it, all look far better. Not just in these still pictures, but more particularly in the trailer. The fact that you think (if you're being serious and not trolling) they look alike is a testament to just how good the SD graphics on Galaxy and Galaxy 2 looked. But if you earnestly can't tell the different in graphical fidelity, sheer quality, between the two, I'm afraid you need to get your eyes checked. Cheers.