Yes,
It is.
I’m working on a small setup where the monitor engineer is using the headphones out on the mixrack cmd32 with an Ipad. I switched on the surface to PAFL2, but when I noticed that the RTA is not following the surface PAFL, I switched it back and gave the ipad PAFL2, but routed the outputs to xlr connections. Its pitty, because I now loose 2 output connectors and can’t use the headphone preamp out which is realy handy fi with the fisher amps passive iem stick. That one does’t use batteries.