Nike Free Trainer 3.0 different versions

[signal]

I saw these in the Nike store last week and wanted to get them. They are the Free Trainer 3.0s:
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But when I searched nike.com to see the colors, they were all a different design:
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Did they change it and why?

 

[signal]

I posted yesterday but it only showed up today… does anyone know?

 

[shoes604]

The black/blue pair (the ones on top) are the 2013 model and the volt/black pair are the 2014 model.