........AND in addition to the information given by
@andcol , your blood is not as homegenous as you might assume.
Depending on what you actually did,,,
One large drop of blood from a single finger prick used twice on a single meter will yield different results anyway.
If you stopped and did a second finger prick on the same finger, then the 9.6 blood could have disappeared up your arm and been replaced by the 12.0 blood in the time it takes you to do it.
If you used different fingers or hands, and also a time seperation then you're shooting in the wind I'm afraid.
It's a guide, not a science. Choose 1 meter, and stick with it. You'll get an idea how accurate it is when you get your a1c done.