Quoted from Rdoyle1978:As was noted above, you need a plant.
…a plant that has practiced writing his signature, or whatever that was, over and over and over again to get it just about perfect every time.
I've signed my name hundreds of times over the last twenty years to any number of documents…never looks the same. Similar, yes. Identical, no way.
Magic is very much a highly skilled craft. Well, good magic anyway.