The German cockroach and the Asian cockroach are very similar in appearance and can be hard to tell apart. However, there are some subtle differences that can help you identify them. The Asian cockroach is slightly smaller and lighter in color than the German cockroach. It also has longer wings and can fly well, unlike the German cockroach. The Asian cockroach is more active during the day and prefers outdoor habitats, while the German cockroach is nocturnal and prefers indoor habitats.