The one from replacementdocs.com is simply the original manual which came with the original distribution of the game. When it was released it came with a card cd case with a brilliant picture inside and a very nice manual (available on replacementdocs.com).
As far as I know, this was discontinued and instead a jewel (plastic) cd case with a thinned down manual was released to take its place. I myself would love to get hold of the original pack again
since my card cd holder is all tatty now, and being the collectionist type I want it in its former glory.