First thing you need to know is that there is no connection between what the remote looks like and how it operates, the functionality is provided by something called a BIN (binary) file and the image is provided by an SPR file. It is up to someone at Sling how they link them together.
In your case both the Cisco 9865HDC and Cox 8642HDC and the Time Warner box are part of a huge family of boxes that use a set of internal made by Scientific Atlanta and are known collectively as the 'Explorer' series.
So both your selections should have worked. I suspect you have a box problem, so check out https://community.slingbox.com/message/10363#10363