Sorry Simon, OCD FTW eh! I feel your pain....
As JJ says, I'd think they were black originally, no idea why they would have been swapped, just for personal pref I'd guess.
I wouldn't worry, should be simple enough to find a cheap pair from (one of the far too many) breakers, if you so desire.
And a single screw in the bottom of each one to change, well within your capabilities!
If you want my 2p, I'd change them purely because nothing else is grey.
Annoying, aren't I....
EDIT: The carpet in your car looks quite a light grey actually, so I wonder if it was deliberate

I've never actually seen a lude interior where the 'carpet' on the bottom of the door cards is a different colour to the floor carpet, not that that means anything at all
FWIW, it looks ace. as said I might change the door handles because its a 2 min job and a cheap one, but certainly wouldn't touch the rest, it's ace.
