Progression level and intensity correlation

If progression level is let’s say 5.1 for a certain workout at 100% (FTP) intensity what will be the progression level at 90%(FTP) intensity or at any %?

Will the calculation change even the Zone itself if % significantly changed ?

If you drop the intensity for the duration of the workout, you’ll be asked upon completion why you struggled through the workout, and your survey response will help impact both your own Progression Levels and future workouts in that zone.