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To obtain the old data, they have used marriage certificates. SVB only uses registered newborn children. In the very old data unmarried people weren't counted, but this still doesn't explain a discrepancy in 2017...

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One small difference might occur if Meertens adds the data of the provinces, while SVB seems to count all registered Dutch babies. In that case births like my daughter's, a Dutch baby born abroad, wouldn't be counted by Meertens.

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Still doesn't explain the big difference...

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After some searching, from their own website:
https://www.meertens.knaw.nl/nvb/achtergrondinformatie

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Please note this is about all their names and data. You can see the popularity per name as a mn too if you look for a specific one, but I don't think that's been used for the list.

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Their sources are different, but I still don't see why there should be such a discrepancy in recent lists. But I do consider both sources as reputable.

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I could always try and contact them to ask...

SVB and Meertens use different statistical bases (Meertens: Dutch Civil Registration; SVB: Social security) but the deviations are really big and I wonder why the numbers of SVB are so much higher for the top girl names—are Dutch expats somehow covered by SVB?

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--elbowin