Location would be my bet. Not sure if IKEA has the same source for their products (might have change sources because of taxes, logistic costs, local incentives

Location would be my bet. Not sure if IKEA has the same source for their products (might have change sources because of taxes, logistic costs, local incentives etc...); and as a commenter specified in this thread, different regions have different conditions (climate, cleaning culture, etc) that might also impact the durability of the products.