Fun fact: The adidas and Nike oranges are identical. Here is a 2012 adidas jersey next to a 2014 adidas jersey next to a 2017 Nike jersey.
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It's all about the lighting and the materials. I have a game-worn home jersey from every year since 1992 my collection and, other than some slight fading from age or washing, they are all nearly identical.
The biggest difference is the materials used. From the mid-80s until 2011, the jerseys were a nylon mesh with a "dazzle" material on the shoulders. Those materials are naturally reflective and their appearances in photos can and did vary wildly. The stretch materials that modern jerseys are made from naturally have a matte finish that is more consistent across all lighting and photos.