No they’re not. The colour depends on what the chicken was fed on, not where they live.

The chicken in Europe have universal health and have minimal education and proper paid holidays and maternity leave, which often they use to take a hobby such as coloring eggs…

Feed.

Colour additives in the feed. By altering the dye, you alter the yolk colour.

So this is weird, because here in Germany the yolks are usually orange, and yes the eggs are unwashed and not refrigerated. But just lately I bought BIO eggs, which suggests better living conditions for the hens, and the yolks of those eggs were yellow. So I thought „does it really have to do with anything?“ 😄

Healthier chickens

I’d ask why eggs need to be refridgerated in the USA and not in Europe.

Yolk yellowness depends what they're fed on.

The feed.

Cooks with poor diet in the US.