All the probes (ThermoWorks, ET72/73, ET-732) should be about 0-1 degree offset. Usually if there is more than 1 degree difference, there's something else wrong like the probes aren't actually the right kind or there's noise or current leakage through the shield to ground. At some point the offset is actually going to be removed from the webui because of this (a single 1-point offset can't compensate for a second order logarithmic curve change).
That said, the ThermoWorks coefficients were calibrated using a lab grade correlation device so they should be very accurate.