Different headlamp units

Hi all! Was wondering if I could change the headlamp unit in my 2008 estate as I have the type with single projector (Bi-halogen H7 type) however I think id prefer to have the type with a projector and separate reflector for the high beam, would it be possible for someone to help me with what they're actually called and more importantly if it'll even work or fit? I'm hoping the connections are all thr same and that its a simple swap job as I would prefer to gave a separate lamp for low and high beam! Thanks!