How come Hungarians have mostly dark hair while Finnish people have over 50% blonde when both came through the Mongolian steppe?

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All Indo-Europeans came to Europe through the Caucasus region while Finnish and Hungarians came through the Mongolian steppe.

Finland has over 50% of the population blonde hair in the country. The highest percentage in the world. Hungarians however have mostly dark hair.

It seems to me that even though most Europeans have been here 30.000 years, Europe is much more diverse than was previously thought.
How come Hungarians have mostly dark hair while Finnish people have over 50% blonde when both came through the Mongolian steppe?
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