This should absolutely not be anything to do with one G4 transmitter vs another G4 transmitter. That would be beyond shocking. Regardless of how old the transmitter is. Whether you can do a “double calibration entry” with a G4 and get the same response as with a G5 would (in my opinion) certainly be open for debate and testing.
However a sensor restart (whether new sensor or restart existing sensor) should absolutely clear all previous calibration entries whether it be a G4 or a G5.
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