Sizing Help!!

I am shopping for a 7 year old boy and a 6 year old boy for winter boots. The 7 year old has shoes listed as a kids 10, and the 6 year old a size 12. When I look up boots, a 10 always says 10 toddler, and a 12 is always "little kid"... is this right? I'm worried I'm going to get shoes too small.