Question about Corsair Vengeance RGB Pro

Hello I wanted to know why (Corsair Vengeance RGB Pro 2 x 16GB, DDR4-3600, DIMM 288 pin... Price 149,90 Euro) costs less than (Corsair Vengeance RGB Pro 2 x 16GB, DDR4-3200, DIMM 288 pin... Price 490,26 Euro) ? Best regards Vahan