Just a thought... do you think your car may have started life with an all black/anthracite interior, and then a previous owner might have painted parts of the interior red to create the 2-tone finish?
There are some parts of your interior that certainly appear, in your photo, like they may have been painted (such as the red dash trim, etc. - I'm not sure whether that was ever an option). If so, then your datacard won't tell you the correct red colour to use. You could check your V5 for previous owner (registered keeper) details and try contacting them to ask if they did it, and how... but, if it was done by an owner prior to that, then they won't be able to help either.
Here's a pic of my Designo interior too (clearly a different red to yours, but I thought I'd share to show what was colour-coordinated with the red leather bits)...