Headphone out to Guitar Line input

I have a 320 watts guitar amplifier with headphone out having its own volume control.

I concerned about the sound signal coming out from this headphone out IF can be use and connected directly to another guitar amplifier via the
Line-input, withe lesser wattage or power.

Would there be any kind of overload on the next amplifier considering the voltage that the headphone out carries and plugged-in to the guitaramplifier line-input?

Ultimately, i just want to use the sound from headphone out as my sound reinforcement & as my monitor connected to another amplifier, be it lesser or higher wattage.

Please if any one has experience on this kind of connection I would appreciate to know it.