LTSpice, Current is not the same after going through identical step up and down transformers
The isolated center part of your circuit is not loss-free. You have resistor elements R1G, Rline and R1M in that circuit. That means that the voltage across L3M is not the same as across L3G. Another way of looking at it is that these resistors consume power, so the power reaching the primary of the second transformer is not equal to the power exiting the secondary of the first transformer.