Is Challenger European butter the same as french butter...?!
There are significant differences between various butters. They have different amounts of fats and the milk picks up flavors from the cow's feed. Below is an article that compared various butters, and the Challenger European was highly rated.
Butter is butter as far as recipes go. Living overseas fo almost 20 years, I think American butter tastes the best and will pay extra for it when it's available.
OF course...There is no difference