Interesting question. I've had concerns w/ Norma 6mm BR brass similar to yours. Only possible explanation is two separate factories or separate manufacturing lines in same factory. Or, maybe "knock off" brass out there which might explain the noticeably lower price. My 6mm BR brass was noticeably thicker than Lapua requiring neck turning. Also, P/pockets were to shallow and had to be reamed to keep primers below case head. Had to develop two separate loads to compensate for the thicker (higher pressure) Norma brass. Hope someone out there has an accurate answer. I'll be following this thread and thanks for posting :)
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