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Seems to me there's no way of knowing this except for separating the 'pops' out. Pops are the ones that pop and go flat under gentle pressure from your thumb nail.
Mate, I 've seen small seed of the same variety grow plants as big/good as big seeds of the same variety. Size is not necessarily a determinant of what you end up with. (I speak of Sativas.)
If yr seeds aren't feminised then you need to learn to spot male plants early.