Why you reckon they keep track of batches? They are doing a live test; that's why. So what variances are there from dose to dose, and what variances are they looking for to net the most end results in cases of:
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Breakthrough infection
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Pre-existing conditions exploited
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Actual cause of death
?
They aren't trying to "kill off everyone" with these vaccines. They are accepting deaths as part of the eventual outcome (for some) in their search for the right formula (or combination thereof) in order to get everyone's immune systems on a subscription basis. It's all about residual income. This shouldn't be so hard for anons to figure out.