A human hair is about 3 thousandths of an inch thick. There's other variables that'll have waaaay more effect on your loads than such a tiny difference in neck length from case to case.
Let the short ones grow until they're the same as the longer ones. Keep them under max (2.015") and you won't have any problems.
Natural variability in the brass means they aren't all going to grow at the same rate.
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