There is more (and less) to similarity than the shape of the flag. Taking in account economic, geographic and cultural factors, a fair comparison would also consider Germany and Netherlands, possibly also Austria, Belgium, Switzerland and UK. The 'rich germanic protestant NW Europe countries' block. For the nitpickers, Finnish is not germanic and Austria is Catholic, but the point stands.
https://old.reddit.com/r/MapPorn/comments/9jyxqt/gdp_per_cap...
https://en.wikipedia.org/wiki/Germanic_languages#/media/File...