It's the mods numbering, some share numbers so you would need to change this. Personally just in case i would recommend everyone make a spreadsheet on like Excel and copy down the CCC numbers because some downloads on here are not always matched perfectly to what it says their number should be.
For a basic understanding when you unpack/unzip the new mod you can go into it's files and you will see there is a number assigned to each character, since all those examples share the same numbers they would over write one or the other. You need to change every occurrence of that number in the files and in the herostat text.
This is why i keep a spreadsheet just in case so i can always double check to make sure the new mod i download won't over write someone else. So basically if two characters share a number change one of them to another one.
For example, with Crystal and Vision, i think both are on Vision's assigned number. I put Crystal in my current game first so i just renumbered the Vision mod to go on Crystal's assigned number.
It's not that hard to do in reality but just know sometimes it would be best do double check a new mod with the CCC.