CrocsClassic Glitter Clog K, Unisex-Child Clog Silver, 28/29 EU

Is there a difference in tie dye crocs. I ordered a pair and they is not the same

My girl wears size 12.5 in shoes what size croc should it be little kid or big kid

If my 10 year old wears a size 3, what size would I pick? Big kid 8-12??

Why is there no big kid size 1? Are they out or just don't make them? The sizes are confusing. Thanks.