Yes they are on separate GPIO for their data. They are resistance based sensors.
From GitHub Readme:
** on your pi use the following GPIO pins. csPin = 8 this one can be any GPIO you want, if using multiple probes you change this on each one, but keep the other 3 pins the same misoPin = 9...
I have CBP 3.0 setup and I am using RTD PT100 thermometers as they are part of the SSBrewtech kettles I have.
I get valid temps when one sensor is connected. When I connect the second sensor the temps appear to somewhat average. My mash tun was at 168 and I plugged in my boil kettle sensor...