A Sarin machine measures diamond parameters (diameter, crown angle, crown height, pavilion angle, pavilion depth, culet size, table size, total depth, and girdle thickness) to the 1/100th of a percentage.
The differences between GIA measurements and Sarin measurements of the same diamond should be minute and neglible. Accuracy of the Sarin probably depends on its calibration and whether it was properly seated on the machine. ia accuracy probably depends on how well the person reads the micrometer.
There are 40 more facets that are not reported on almost every Sarin report.
Only 17 facets are in these reports.
We reports the angles and degree location of the "mystery facets" - How well these facets are aligned help to form the Hearts and Arrows image, so they do have important and necessary reasons for being reported.
It also isn't just the angles.... the degree location is also important too.