What year? If you're talking about the newer boats, the 175 is wider and has a different hull design. It's a modified v-hull, where as the 16 ft model is more like a flat bottom. Livewell systems are different as the 175 has recirc and pump out, where as the 16 ft model only has an aerator switch with no recirc or pump out. Compartments are laid out different. More storage in the 175, small cooler in the floor, and a trim switch at the bow with recessed trolling motor pedal where as the 16 ft models do not have that.