They were the same. First generation RRS (L320) was used a semi-monocoque/body on frame like LR3- LR4 through MY 2013.Aren't the LR4 and the RR Sport the same chassis? Hmmm.
Second generation RRS (L494) MY 2014 to current (like the one shown), is a true uni-body.
That Company's kits/lifts are for uni-body vehicles. Looks like it sure works though !!