Is 'Dendroaspis viridis fifinka' a valid subspecies of the Western Green Maba??

I'm asking because I'm about to embark on a few Mamba pieces (I draw with coloured pencils in my spare time...) and I'd love to draw a head/neck shot of a particular Mamba I have found a few headshot photos of.

The photos are labeled 'Dendroaspis viridis fifinka'....

I've done google searches, google image searches, and nothing on 'fifinka' beyond those few photos.
(Link at bottom of post...scroll down, fourth row from the bottom. The entire photo page is eye candy.)

The locale of the Mamba is Ghana.
Is this an outdated/un-recognized subspecies, or simply a geographic colour variant??

(I have a photo of a D.viridis from Ghana, and it looks remarkably similar....same jade/gray green coloured head, etc.)

Any info is appreciated.
If anyone has a great photo of 'fifinka' or a Ghana locale Viridis to share, please feel free to do so.
(Head and neck shot, or even better, head and neck draped across a coil.
Thanks for any info...

(I'm not a Hot keeper. As close as I have to venom in my collection are captive bred dart frogs. lol)

BB

D. viridis 'fifinka'

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"Have you hugged your drummer today?" --- Me