Colour can shift because of the paper, the ink, the press settings, the lamination on top, or the light the box is viewed under. A screen shows light; a box reflects it.
The most reliable control is a signed printed sample, a whole range run on the same presses, and checking production sheets against that sample.
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More guides: Why a spot colour can look different on the box · CMYK vs RGB: what to send your printer · CMYK vs spot colour