Separate entries should not be a problem. This was done for instance in the case of the artists
Matt Furniss.
However, if you check the entry for
Amiganoid, the game appears to be featured in the
Pinball Nights compilation (MIA and from 2002 though).
So I'd imagine there is a possibility that the non-PD DI took the PD developers under their wing at one time and therefore the PD developers decided to make a logo for that.
Well, that's just what I suppose from checking the entries. Perhaps someone else has more specific info on the matter?