The Rt and Lt legs cannot be interchanged. This is because they are shaped to fit RT and LT on the TV
The front ends of the legs are wider and the back ends of the legs are shorter. So on a 60 inch console the rear legs are about 1/2 inch on both sides, and the front legs are 1/2 inch outside of the 60 inch span of the console.
The answer given by LG is "so far out of context" that it's not even relevant to the question asked.