Normally, BMA490 sensitivity error couldn't beyond 10%, I'll check this value and feedback to you. Meanwhile, have you compare 3~5 bma490l g-value output, or just use one bma490l make test?
BMA490 config: odr? range? normal mode?
More info from your test enviroment/procedure.
How do you generate accel apply on BMA490l and A9012? What's the real accel value?
As attached photo, the relation X/Y/Z with Main g? Angle/Phase?
BMA490L and A9012 test at same time and postion?
Could you upload BMA490L and A9012 log data before/after your test?
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