Made the side view comparison below from official spec sheets, G60 vs. G30
I think the most interesting part is the seating positions (red line). The base of the seating surface on G60 is obviously higher than G30 due to the thickness of the battery pack. To maintain the same front seat headroom, the roofline, hood, front fascia, and shoulder lines are all raised accordingly. See how the rear seats in G60 are comparatively higher? Again we have the battery pack to thank.
The tip of the trunk actually share the same height (blue line). Visually this gives the G60 a more drooping tail line since the rear window base sits higher.