Thermostat with multiple uths

The thermostat that I have has three outlets for controlling three devices, but only one probe. Can I plug a couple uths in it, if they are the same size? What if they are different sizes but from the same company?

You can plug in three identical UTHs (provided they are within the maximum wattage allowed by the thermostat). Anything other than that will lead to different amounts of heat being generated by each heat pad.

Thanks! I figured it would have to be identical units....