I followed your steps, they worked perfectly. Here are my numbers.
Yep, that's clearly different. My Bangle.js 2 has about 63 PPM at 19 C and yours is around 71 PPM.
btw, the graph I showed earlier was made with LibreOffice Calc: I measured some temperature/PPM pairs, made a chart of them in LibreOffice Calc and added trend line (polynomial, degree 2).
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