I own a Plaid and I have had a LR '23 S as a loaner a few times. I'm going to guess they aren't limiting the 0-60 times. At low speeds, the motor torque is limited by the max amps that can be sent through the motor. The battery has plenty of power available, but the current through the motor is the limiting factor. Thus, the motors are limited to the same torque until about 50 mph in the Plaid. You can see the straight line in the graph below. HP is increasing because torque is constant, and RPM is linearly increasing.
Above 50 mph, the battery power limit kicks in, and then the limit of the motors is set by how much power can be delivered from the battery. Therefore, you get constant HP up to about 100 mph. Somewhere above that, the back EMF of the motors starts limiting the max current that can be pulled from the battery, and the power will drop off again, but that seems to be a very gradual drop off, somewhere around 200 mph.
Anyway, so back to the Long range. If the LR really has 2 model Y motors instead of the 3 in the Plaid, we can expect about 2/3 of the torque of the plaid at launch, up to about 50 mph. But, the Long range has a bit of an advantage since it has the same battery as the plaid, it can pull max power from the battery and maintain that 2/3 torque for longer. Someone could datalog the Long Range, but I'd guess there are parts of the curve where it pulls nearly the same KW from the battery as the plaid, because it can.
But, the whole thing could be a bit different depending on the gearing of the rear motor in the Long range.
TL;DR I suspect the 0-60 isn't limited in the Long range, but the mid speed is pretty strong thanks to the plaid battery, which is why it gets a better quarter mile time than the Model 3 performance, even though the 0-60 might be the same or slower.