Any good paint shop that the car guys go to will be able to eye match for you in 2K or acrylic. Look for where the petrolheads go and hopefully is run by a guy who used to paint cars for a living.
I only use 2K as doing professional repairs I'd rather have the durability on nose n rails so it still looks good in a year or two.
Also, 2K cures much faster so in summer I can have it handled in a couple of hours and on the water / dragged around on sand the next day. But it is seriously toxic crap so you need to be sensible.....
For the latter reason many choose acrylic.
It is really hard to match, after about 30 or 40 times watching and listening to the paint shop guy I reckon I could do maybe 20% of the jobs myself. That's in really basic colours.
The issue we have is with Australian paint systems they don't have the right tinters to do many of the overseas colours. The brightness of the blue and orange used by Cobra for example. The fluoro orange used on JP and Starboard a couple of years back simply can't be matched so you need a really good paint guy, and paint it over white base, and a long fade out distance (or fade it out around a logo so its less obvious).
No way will you match by yourself without a lot of practice and at least 20 tint colours at home. Even then some just can't be matched.
Thus - pay the man. $25 for 200mL of a match that will be right saves a lot of heartache lol.
Then your leftover dribbles will enable you to modify other base colours and have a play with matching.
But when you look at a white (apparently), but add grey and green and then get it spot on and you knew that sh!t - you will be proud of yourself and tell everyone.

As to airbrush- takes a bit too long.
Get an HVLP gun with a 0.8 or 1mm tip - you can dial it down to about a 10mm dia spray pattern with virtually no fluid flow or up to a fan wide enough to spray a rail.
The $25 ones eBay actually do just fine, just only last maybe 10 jobs.