They both are the same drive as you can confirm here in this link: ARK | Intel® SSD 530 Series (180GB, M.2 80mm SATA 6Gb/s, 20nm, MLC) the difference is in the package. Intel does not sell products directly to end users. To get more details on it, please contact one of our resellers. You may want to contact your nearest Intel contact center to find out about your nearest reseller by accessing this link as well: Contact Support - If you are located in The United States or Canada, you may try this link for a list of distributor: http://cache-www.intel.com/cd/00/00/08/99/89937_89937.pdf
Thank you. Your answer is very helpful. It means that I can buy a cheaper version. To be honest I do not understand why in the same re-seller there is 50$ difference.
So, I am ordering SSDSCKGW180A4.