Renaming Poker software

So if you are familiar with these sites maybe you can explain to me the differences between them..

Cardspike
Sportsbook
Players Only

This is leaving me so confused...because all the software is the exact same!!!!

These are all part of the same poker network.

A poker network is when a certain poker software (ie, microgaming, ipoker, cereus) are used by many different poker rooms who are joined together to make a bigger player base.

The above sites belong to the Cake Poker Network.Its an affiliate program with benefits for the participating rooms.More traffic Integrated cash system same tournaments. The sites have also their unique promotions to drive players to play and to their room.
Below the sites belonging to that particular network.
http://www.cakepokernetwork.net/Partners/Default.aspx