Similar but actually not, at all.
Were the exact same ones available in the shops or just specially made for the movie?
If normal "shop" ones then it would be a similar situation to the plaques I suppose but if they were only made for the film (ie with the name perhaps) then it's not.
As it is unknown which plaques were sent then yes, they should all be worth the same (taking condition into account obviously) but if it is ever discovered which were actually sent then it would be a little more similar to the sunglasses. They would also probably be worth a lot more and the others probably not so again, no, especially as that happens a lot in films where they have multiples of the same item but they were only made for that specific film as opposed to the plaques which weren't.
Cheers anyway.