Toybox.Activity.Info vs. on Device Pressure

Apologies if this is a common topic - couldn't find anything recent.

I've implemented pressure readings on my watch faces, but I am running into something I can't quite figure out. None of the available pressures in CIQ (ambientPressure, rawAmbientPressure, nor meanSeaLevelPressure) from Toybox.Activity.Info match the on-device pressure widget.

Does anyone know why this may be the case, and if so, how I can match the pressure readings up? Am I using the wrong variable, or is there some other issue? Some users are confused, and I am as well!