The Livescope runs a frequency range of 530-1,100KHz
Any sonar with a frequency in that range may cause some interference.
That said, the Livescope sonar beam is 20 degrees wide in the forward view, so most times you may not be pointing it into the other sonar coverage area.
If you do get interference, you can change the frequency on the HB units to a lower freq. such as 455.
I have not run a Mega unit at the same time but have run the older 455/800 transducers with the Livescope with no problems.