Keyboard Replacement with Unibody-style-keyboard

Hello!

I have bought an older but still powerful Macbook Pro 15- Laptop with 2.5 GHz and 512 MB VRAM! I am very happy with it but I really like the newer keyboard-style of the newer macbooks (pros) with black and non-clustered keys. So I would like to install such a newer unibody-keyboard into my 'old' Macbook Pro. Is this possible or will some keys not work properly? What problems are there, would be there? Would this replacements possibly damage my computer on the long run? Thank you very much for any useful answer!

Goodbye

Marco.