Typically the difference between the wired and wireless tool should be the wire or lack there off. However the the corded and cordless drills are both quite different from each other in typical design and extra features.
Common traits -
Why do these 2 tools look so different? My guess would be that when they were designed corded was for industrial use, and cordless started as hobbyist.. and the design has not evolved as fast as the userbase has..