Just because it looks the same, does not mean that it's the same under the hood. Designs are constantly improved and re-worked for safety. Look up what happened when the IIHS introduced the small overlap test. Several manufacturers (including luxury brands like Mercedes-Benz) failed the test before re-enforcing the same design to make it pass. Not to mention active safety systems such as pre-collision braking and the like, which don't exist on older models.