I'm sure this is Ditko because nobody could ghost him this well, and surely nobody ghosting him would go so far as to include Ditko's almost trademark patterning in the work:
I mean, this uncredited page from The Many Ghosts of Doctor Graves is clearly by Ditko and not a ghost artist, precisely because of such detail:
And whilst this form of crosshatching might easily be used by many cartoonists, it adds to the feel of the work and the weight of line and the characterization that a comics fan; a geek, if you wish, can easily recognise.
So now we turn to the second work in Ghostly Tales #43 that is credited to Pat Boyette, and we can see that whilst it is really good art, with it's own style (I know people who prefer it to the Ditko style), it is clearly not drawn by the same hand as the earlier story:
While we are all here talking about Ditko, I thought I'd show you this; it's a fantastic example of the man's pencil and artwork from one of my favourites, The Creeper (which I purloined from Dial B for Blog, a great site):