LR and DNG conversions from NEF

Just received a batch of Nefs and corresponding dng conversions from a client. I immediately noticed that there was a serious white balance difference between these pairs--LR shows the Nefs at 5600 and the dngs at 7100. Is this typical. I have worked with dngs a few times, but this is the first set of images that I have seen with side by side conversions. Is this typical? Neither the dngs or nefs have been previously edited. I don't normally work with dngs--only when a customer insists.
Very curious about this WB difference. Any explanations from the color gurus here? TIA

I was aware that the numbers were relative and would likely be different, but in this case the images are visibly very different--I just gave the numbers to indicate what LR saw them as. When the difference is between 5600 (NEF) and 7100 (dng) one sees a big difference between the cool NEF and the warm dng on the screen. This difference is seen systematically in a batch of about 75 images. LR shows no metadata differences except the WB reading. Could this have resulted from a dng conversion in an older dng converter?

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