In a broad sense, mazesoba and aburasoba are basically the same thing, "soupless ramen". However, these two noodle dishes have some key differences. First, there is a difference in the type of toppings. Abura soba focuses on enjoying the flavor of the noodles and is very simple, served with typical ramen toppings like menma, chashu pork, and green onions as common ingredients. Mazesoba, on the other hand, is a dish that is enjoyed with a variety of toppings and different flavors. Taiwan mazesoba, for example, is made based on Chinese-style flavors, including Taiwanese-style minced meat, which is spicy and fragrant. There is also a difference in how the noodles and sauce are combined. In the case of abura soba, you mix the sauce and oil in the bottom of the bowl yourself, whereas the sauce in mazesoba is already mixed with the noodles and seasoned. The reason for this is thought to be because of the large amount of toppings in mazesoba, which makes it difficult to mix the noodles and sauce together properly. If you want to compare these two dishes, I have abura soba recipe too!