Well, you’d really need to define “original” because all the published editions are somewhat realized and edited.
The Le Dentu is entirely in only two voices, which I myself find rather thin sounding. I would say the van Campen is closer to most of the usual pedal harp editions than the Le Dentu. Of the published pedal harp versions, I would say that the van Campen is most like the edition by Lucile Lawrence. It does have some clunky spots where I think the lever changes could have been handled better.
Both include all of all the movements, as far as I can remember off the top of my head, so you could play either with orchestra, but neither has much in the way of a cadenza. (Sorry, I don’t use either of these when I play it so haven’t looked at them very recently.)
I don’t know the Griffiths, so can’t comment on that.