The later model spring rates are softer, and the front struts and rear shocks are valved differently. Just be aware that the later models have a stiffer front sway bar and slightly stiffer rear beam axle to make up the extra body roll from softening the springs.
But before you go through the trouble of a suspension swap, ditch the OEM 17” rubber band tires and get some 15 or 16” wheels and tires if you haven’t already - it will make a much bigger difference in ride quality than the subtle change to the suspension.