Not too sure about the difference. The water level would just drop, and the water simply flow away from the shallow coastal areas. I don't know what would salinity the water would have reached after dropping 200 meters but it's not the one you get if you simply let a volume of water to evaporate completely, which would be 100%.
It's how the Great Salt Lake and the Dead Sea got super salty? The salt doesn't evaporate away with the water, leaving a higher concentration of salt in the remaining water. If it all evaporates away, you wind up with a salt flat.