Snow tires are designed to provide maximum traction and control in winter weather conditions. The tread patterns of snow tires are specifically designed to grip the snow and ice, and to channel water and slush away from the tire. Different tread patterns can have different characteristics and may perform differently on different types of snow and ice.
Using two snow tires with different tread patterns on the front of a car can lead to uneven handling and braking. This can be dangerous, especially in emergency situations. It is always best to use four snow tires with the same tread pattern for optimal performance and safety in winter conditions.