As far as I can find any info they have some slight layout differences...
I have not been able to find any useful information regarding this, and I have no idea why is it that way.
A little theory of mine though is that the Purple one is older and it had some minor problems and therefore the CE was released to fix these (?).
A little sidenote here to, the CE seems to be more popular too.
Hopefully someone else has more info on this matter.
Oh, and if you find out anything on your own please tell me too.
