Take it you're referring to the standard eight spoke wheels (with the wide chunky spokes, like mine).
I had to do the same research when buying a spare for mine - they are definitely the same wheels, just different colours. They may have different part numbers on them but that's only due to the colour difference.
For extra piece of mind, if you take a wheel off, the offset can be found on the inside as ETwhatever (can't remember off the top of my head, could be 45 but not sure). But you don't need to check - they are the same.