If you have some of boys an hand, then maybe try a mismatched set on the main 2-channel side and push a stereo signal though it?
Maybe one can hear it… Certainly if the cables are very long and one has a high inductance or capacitance compared to the other.
But with a movie or some visual stuff playing, the mind is only able to keep track of a finite amount of stuff happening. And the HT side is less stressful in terms of audio needs.
Personally I would keep the L/R/C the same, and not have any chest tightness, but I am a Luddite.