The model you asked about is a Samsung OEM version made specifically for Dell. It may have more or fewer features than the standard consumer retail model of the 840 Pro. Sometimes the OEM versions wind up being sold at sites like Amazon and ebay. There are quite a few Samsung ssd's on ebay that were OEM bulk purchases by Dell and Lenovo.
Samsung controls about 50% of the entire ssd market - OEM, Enterprise, and Consumer. The bulk of the sales are OEM versions sold under contract to a variety of pc companies - Dell, Lenovo, Apple, Sony, and many others. Each OEM model for each pc company has a different model number, different Samsung product number, and different SKU number. As a result there are quite a lot of model numbers.
There is another problem. If a consumer purchases an OEM version at a retail site, then Samsung will not honor the warranty. The reason for that is the pc company that made the bulk purchase is responsible for the warranty which will be the same as the pc it was installed in. Those warranties are usually only for one year instead of 3 or 5 years.