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Good question, I have seen the 2 publicity photos of them side by side, those are rather artistically shot.
Here are 2 screengrabs from the LS Overview video over at Lexus.com. They have an LS 460 morph into an LS 460 L at the same location. The 2 cars have identical overhangs on front and rear, and more subtle differences which make it a bit more difficult to tell them apart vs. their Teutonic counterparts, IMO.
No problem!!! Yes the easiest way to tell is the rear door. The back seat space on the LS 460 is large and comfy, but the LS 460 L has it extra large and often with extra features.