I know it's easy to get caught in the weeds on the paint match (I've been down this road). I wouldn't stress it. If it's not a perfect match, it will still look good. If you were restoring a playfield and had to blend it, it would be a different story. For the cab, you're essentially paint matching for the bevel, and to some extent the back of the backbox. If it's really close, in my opinion, it's good enough.
Contrast this to the paint match work I've been doing on a Future Spa apron. Total nightmare! I can't match it due to changes in the regulations, they don't make the paints and pigments anymore to get what I'm looking for. I can keep fighting and getting crazy, or I can get as close as I can and do my best. Worst case, I sand the whole thing and paint the whole apron in a new base and re-decal it and clear over that. You can get too caught up in this, trust me.