Yes, and Legacy engines are the same way. But it works if you keep at least a ten foot distance between enignes even with something that does not have cruise or with its cruise turned off: then, one might gain on another if the other is going up a hill, etc., but over the full loop they even out again. Makes dtermining what is "exactly the right speed" for the LC+ alot more difficult though.This works because you are using an MTH engine with PS2 or 3 in conventional. They run with cruise control even in conventional. It would not be so simple with any other engine.
LC+ engines have cruise as well. All you really need to do is start the MTH engine and increase the voltage to a satisfactory speed. Then use your LC handheld to match that speed.