Hey Max, welcome aboard, as for the controls, well...
The steering wheel you currently have has a 2-way connector in the wheel for the horn, your new one has the same connector plugged into a 4-way one to allow the controls to operate as well as the horn.
Unfortunately, your car only has the two way connector coming into the wheel. Without a Haynes to guide me, I have no schematics to tell me where this connects to, or to give me an idea of how hard it would be to make up, if at all possible with the wiring harnesss in your car.
Then of course there's your HU, and will it take it as well?
If it's the leather one, then it's not too bad a buy, but if you bought it for the controls, there's a bit or work to do to get them working.
I bought mine for the leather and disconnected the extra block for the controls as I don't really want em, and couldn't use em with my HU anyway.