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The Northwest European you see in both populations it does not mean exactly the same, although admixture classified it the same way. In the British Islands and Ireland they are more likely composed of R1b (Atlantic/Celtic folks), while Scandinavians probably have huge I1 autosomes (Nordic). There's Scandinavian influence in Britain, but it's not incredibly important in average. If you check the Mediterranean map, you'll see that also Mediterranean does not mean the same in all populations.
We'll have to wait for more accurate analysis, but for the moment, the Euro7 Calculator with 4 European clusters it's quite ilustrative.
You are right to consider MtDNA though. Y-DNA frequencies usuallly don't match with the autosomes. For example Iberia has a lot of R1b, and in my opinion the main composition is I2a1a* and similars. That makes sense when we see the high Southwestern in the Euro7 calculator, being this type of clades the best match for a cluster like this, rather than different R1b's (more likely Northwestern). And Iberia for example has a lot of MtDNA H...also Basques, but in my opinion they were the most influenced by R1b's, that's why they show higher Northwestern and have the highest R1b percent in all Iberia today.
And we could find other examples not matching Y-DNA frequencies. It's an indicator that must be considered with caution, and always comparing with autosomes to get a better idea.