Some incompetent pretended to make a "new" coin without changing the "magic bytes" that differentiate chains?

That was, like one of the very first things learned about cloning bitcoin, where did whoever made this thing even get the diff they used to find all the places where one coin differs from another?

They compared a chain that also had not done it right against the chain that failcoin was cloned from, maybe?

Or just hadn't even heard of diff, maybe?

-MarkM-