Could someone explain to me why the Irish and Scandinavians are virtually the same autosomally

[Trouble]

How is it despite being hundreds of miles apart and separated by ocean they appear to be the same people?

"sample": "Irish:Average",
"fit": 1.449,
"Norwegian": 100,

[nittionia]

Nw europe is very close genetically, and the groups can often get intertwined in these calculators and gedmatch. If you compare 23andme reports (which I believe are typically very accurate for nw europeans), you can see that they are often successful in differentiating these groups, generally speaking. Irish people will usually score some % of Scandinavian, but will overwhelmingly be assigned areas in the British Isles.

[Jana]

Shared Dutch Bell Beaker ancestry. Also there is Norwegian input in Irish and Irish input in Icelanders and Norwegians. They aren't the same though, but close indeed.