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IMHO the difference is very noticeable between people in far north and far south of Poland as you can see in these pictures (they're not cherrypicked). You can see darker pigmentation in the south and far more common Dinaric influences etc.
Girls from a little town in Northwest Poland
Elbląg (Northern Poland)
Spoiler!
Southern Poland (Małopolskie / Lesser Polish voivodeship)
Spoiler!
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