If your purpose is to change what is printed on the keys, the only way to find that out is contact a store that sells Apple products. Nobody here represents Apple or any store, so asking here will not likely give you much useful info.
If your purpose is just to change which key does what, there are software fixes for that if you would say exactly what you want changed to what.
This note by Apple is supposed to show what the different keyboards look like.
can I change the keyboard on a russian macbook Pro against a german keyboard?
If you want to change your MBP keyboard from a Russian one to a German one, then, as Tom Gewecke says, first you should ask an Authorized Apple Service Provider
However, my bet is that, when you find out what price they quote, you'll start looking for keyboard overlays or stickers, such as