This is due to the fact that our prices are mostly automatically based on the market price. In this case, the comparison indicators are different even for each colour. In addition, due to different suppliers and delivery conditions, we cannot always offer the same prices as other suppliers, especially in international comparison. We always try to set a price in line with the market, but this is not possible for all products.
Unfortunately, I couldn't find this information anywhere at the manufacturer's or on the web in general. With a bit of luck, someone else will answer your question.