Hi I found this on the internet at a site called "cuteminithings". The purchase of Bluebird by Mattel could explain the variations. "Disney's Tiny Collection (also called Mini Collection) was made by the same company that made Polly Pocket and is very similar. Most often it is listed as 'Disney Polly Pocket'. Bluebird was later taken over by Mattel".
Also, I have noticed that the UK items often have a purple variation. Hope this helps.