In any Battleforce I've bought, its just the entire contents of each box emptied into a bigger box.
For example, a Tau apocalypse force I bought had 2 Sky Rays and 1 Hammerhead. Each Sky Ray normal box comes with the full hammerhead weapons sprue (for the same price as a hammerhead, hence why my FLGS stopped stocking the HH box and only has the Skyray). However, the box still came with 3 full hammerhead sprues + 2 sky ray sprues.
Now I can't say specifically for the Cadian stuff but i'd have to assume its the same thing.