Not necessarily, no. (Yes, I own a PT and a copy of QL)
Sometimes predicted pressures have lined up quite well for me. Other times they're off. Sometimes they're _way_ off.
Even the PT may need 'calibration' on a particular rifle. Probably will, IME. Calibrate it like Harold Vaughn suggests in his book Rifle Accuracy Facts if you can (using a hydraulic system). If you can't do that, use factory ammo as a reference point, depending upon how well your rifle & speeds match with factory test numbers. For example, my Creedmoor rifles both shoot/shot Hornady factory ammo very close to advertised speed, and they have/had 24" bbls just like the test barrel. That plus specific pressure data for that lot of ammo allowed me to get a good reference for the PT on that rifle.
DO NOT rely on QL predictions to keep yourself or your equipment in 1 piece. Rely on published, _pressure-tested_ data (some information came my way in the past that not all published load data was actually pressure tested. I've not been able to verify that either way).
