I just received these two dolls this week. They might look similar but are not exatly the same. The one with the orange hair was the one sold in stores, but the one with the yellow hair was only given to the participants of the Barbie Convention in 2003. Can you notice another thing that differs them, besides the hair and the outfit ? The laptop computer of the convention doll has a 2003 Barbie Convention Logo on the screen.
Bonus items included with the Modern Circle convention doll are - a Vinyl Modern Circle Bag, printed on the bottom is "2003 National Barbie Doll Collectors Convention", a Pink leather notepad portfolio and a pink and white coffee mug imprinted "2003 National Barbie Doll Collectors Convention".