There is no big difference between the two bikes.
1. The main difference is the upper top tube of the frame. The top tube of a Himiway Cruiser is higher. Step-thru's top tube is relatively low, which is more suitable for someone who is relatively not tall to get on and wear skirts.
2. The color of Himiway Cruiser is black, and the color of Himiway Cruiser Step-Thru is white.