I just got a question

So I've been looking around ebay and mecari. Been looking at a porunga funko pop from eccc. And as I was getting ready to purchase someone said the stickers swapped. And that made me question. If someone puts a eccc sticker on a shared convention pop. Does that make it a legit pop from the actual con. I've heard that it does but I'm not sure so I thought I'd ask here.