Ah and I thought it hadn't been posted! Of course I'd only searched DB1 and Deutsch-Bonnet related, not only DB.
My understanding is that - like most race cars of the time - something like a grill may have been changed due to accidents/visual preferences and so the one shown in my puzzle might be a very early prototype version of it prior to the finished design seen in the earlier puzzle.
I may also have edited the image slightly to remove identifiers (not a central grill divider of course) so that might have something to with it also. I'll check once I get access to the original images again.