I think it's a nice companion for the Lange 1, without being too similar. It has the large date, which is one of Lange's most useful features, but is a simpler and thinner watch. It also has a different movement, the Sax-0-Mat with the micro rotor.
I went with the black dial with rose gold case, as my Lange 1 was a platinum moonphase. For your Lange 1, I think a white dial with rose gold case would be perfect.