That's hard to do on an already-painted body. I would think it would be almost impossible to match the shade and quality.
Some paint stores have a handheld spectrum analyzer for paint matching -which will throw off an exact actual color chart codes -like Pantone, ITT, Munsell etc etc (Not sure what a brand will use)
Probably worth calling a local paint store -like Sherman Williams etc..... Hardware stores are less likely but may have some equip.
Is the goal to basically find a rattle can car color that is as close as possible?
You can't just ask Sterling / Ernie Ball support?
It's not surf green. Looks like metallic faded green.
Looks like a lighter tint of the hues Seafoam Green or Seebreeze Mist.
That looks very similar to reranch "Surf Green", a Fender color.
https://reranchstore.stores.yahoo.net/fencuscol.html
You will not find a perfect match in a rattle can. If you can get a match mixed up, take it to an auto body shop and see if they'll spray it. They have everything I mentioned you'd need.
IMO, it's not worth it. I have a pint of clear, a pint of color, and some hardener for a guitar project I'm looking to finish this month and it cost me $100 for just that.