Price of basic carrier rail

My CLA is SB. SB's basic carrier rail's price is, for example, 389.91 EUR. Its part number is A1178900193.

https://www.online-teile.com/mercedes-ersatzteile/A1178900193_Basic-Carrier-Rail.html?language=en

But CLA coupe's one is 292.44 EUR. Its part number is A1178900093.

https://www.online-teile.com/mercedes-ersatzteile/A1178900093_Basic-Carrier-Rail.html

Um... WHat's the difference between them????

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