Sena SMH 10R, multiple bikes ?

I have always been an autocom user and presently have it on my 12 GTL. Have recently picked up a NineT that I use my Nav5 on. For riding with my daughter who doesn't have autocom on her bike I bought a set of Sena SMH10r communicators. When riding on the NineT I hear the Nav5 and communicate with my daughter fine.

I will be taking a longer ride with her and I will use the GTL. Do I need to eliminate the previous pairings and pair it with the GTL or since it is already paired with the Nav5 will it pair automatically with the audio system on the GTL?
Thanks