Depending on how and where a DECA is used on a customer's installation, it's the same as a CCK.
However, if you have a HR24-500 it already has a built in DECA. I would call back and ask for a CCK-W it is 25.00 with a 6.99 s&h fee.
If you have a wireless router, you can connect the CCK-w to the back of your receiver and connect it to the internet. It acts as a wireless adapter for the back of your receiver.
I would definetely call and ask to speak to a CSR in tech spt to get some additional guidance as to why you were ordered a Deca instead of a CCK
They sent you the wrong device. However, a hard wired set up is much more reliable than a wireless one. if you feel adventurous, you can run a coax from your router location to your SWM splitter and install the DECA BB next to your router. you can also call DirecTV and request professional installation to have a tech install this for you. Perhaps they can waive the install fee since they made a mistake.
or if you want the less preferred wireless set up, call DirecTV and have them send you the correct adapter.