Well the thing is... what most of us know as "the original" isn't. It was originally a series of radio scripts which covered a similar but not identical plot and dialogue as the first three books. Even the older british releases of the first books are subtly different than the later releases and the one first published in America (which I'd assume was the same as the canadian printing since it's the first copy I've got with a canadian paperback price on the spine but...).
But again... all the previous tinkering was done by the man who created it, as he is unfortunately deceased I'm not sure who has character copyrights or creative control.
"Genes, Like Leibnitz's monads, have no windows; the higher properties of life are emergent... And once assembled, organisms have no windows." - Edward Wilson, Sociobiology