EASHL Club Custom Jersey Differences

This is not a post to tell you to upgrade the jersey styles or logos (although you should), it's to basically ask what the differences in jersey styles are when creating your own custom jerseys for your EASHL club? You provide 18 different styles, and of the 18 there are nine series of two jersey styles that look identical with no differences. I've tried using each one to see if I could spot the differences, but couldn't come to any conclusions. It would be greatly appreciated if you could let me, and others like me who are curious, know exactly what the differences between them are. If you need some examples:

Jersey 1 & 10 look the exact same
Jersey 2 & 11 look the exact same
Jersey 3 & 12 look the exact same

Jersey 4 & 13 look the exact same

Jersey 5 & 14 look the exact same
Jersey 6 & 15 look the exact same

Jersey 7 & 16 look the exact same

Jersey 8 & 17 look the exact same

Jersey 9 & 18 look the exact same

What are the differences?