I'm not sure exactly what you're asking, or what you mean by "manufactured tracks". Assuming you're asking about DR2.0, the rally stages are based on real-world rally stages, some of which are pretty well-known (El Lloar-La Figuera in Spain, Col de Turini in Monte Carlo, El Condor in Argentina, Ouninpohja in Finland, Sweet Lamb in Wales). They're not laser-scanned replicas, but they're recognizable recreations of the real-world locations. There's a good variety of stage types, ranging from the slow, tight, and technical, to the fast & flowing. Then there are the rallycross tracks which are also all real-world circuits from the FIA World Rallycross Championship (various years).
Stage rally multiplayer is asynchronous, meaning you don't see other cars on the track; everyone drives the stage and you compare times. Rallycross multiplayer is simultaneous; you race directly against other players.