After seeing your bass in person on more than one occasion, I'll state here my educated guesses about your bass:
1. It's a naturally very dark Coco Bolo and
2. It spent some amount of time in the sun
I would sooner forget about green pickups, Paul. Sorry, they just are not my taste, and since I've seen plenty of pickups turn green in the sun, with heat exposure or with highly acidic sweat, they look to me like Foghorn Leghorn says, Two miles of bad road. If you ever need a replacement, I recommend 2 new matched pickups I don't think we can color match the particular aged green yours have achieved.
Back to the experiments in color, mom has agreed that the next Brown Bass we make for the showroom will have brown pickups. Yay!
I also like the color combo on Mike's guitar. There's so many nice browns in the wood, the 2 tones on the pickups work really well with the laminates, without being gaudy. I love it.
The brown pickups can't really be matched except for the casting batch. Each group will come out slightly different, so it's sort of fun to see what hatches.