Being at the height of 350m is already pretty high. Extending that to 450m? The untrained eye may struggle to see a significant difference in view.
In terms of how far in to the distance you can see, there is very little difference. On a clear day, from both the Skytree Tembo Deck and Tembo Galleria, you’ll be able to see Mt. Fuji, Asakusa’s temples, Shinjuku’s skyscrapers, Tokyo Tower, Odaiba’s Ferris Wheel, and more.
The main difference in view is the angle that you’re seeing the buildings from. From 450m, you can see more of the buildings that are close to the Skytree. Other skyscrapers and Tokyo Tower, buildings that are farther away, can be captured at a better angle from 450m too. For photographers, I highly recommend bringing a good zoom lens and heading to the Tokyo Skytree Galleria for the better angle and view.