Hi, Frankie;
It should be the NATO Stock Number. All military equipment used by NATO has a NATO Stock Number, used for inventory purposes. I never saw any pattern to the numbers and I have no idea who arrives at the number or how, but it's used for inventory and ordering purposes.
I suppose it's quite possible to have the same item made by different manufacturers to the same specifications; as long as it was the same item, the stock number would be the same.
My guess is that these matches are to the same military specifications as the others, they're just made by a different manufacturer or in a different package.
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