I have seen the screen used Remote Mines in Planet Hollywood in London back in the year of the films release, and I can say for fact that the one's I saw all had 6 identical LED's & holders. The colour of the screen used versions was a different shade of Kaki Green to the one's I've seen as replica's (which include the one I made).
It's possible they blew and were replaced at some point with not exactly the same kind. The pics i saw were from EON but i have no idea of the date they were taken.