Have you seen results from Podolia on Gedmatch?
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My EE regions are only semi accurate
I got east Prussian ancestors from Masuria but not get the Warmian-Masurian Voivodeship region insteas I got Podlaskie Voivodeship, but its not that huge of a distance.
Omsk is most likely accurate based on German PoWs in Gulags there.
According to DNA Tribes my top 3 are Czechs, Slovenes, Slovaks; the Slavic Triangle:
https://i.imgur.com/9nHzysB.png
When I did "People who match one or both of 2 kits" with two Masurian kits, I found a Polish guy from Łomża & Mały Płock among their top matches:
https://en.wikipedia.org/wiki/%C5%81om%C5%BCa
https://en.wikipedia.org/wiki/Ma%C5%82y_P%C5%82ock