I've used Rapco Parts' paint many times, comes in spray cans as well as gallons.
Just reduce it around 10:1 to 8:1 depending on your gun, with Naptha, xylene, tolulene.... whatever is available in your area and spray it on.
Colors match pretty well, only issue would be that the gloss is a little bit too high at first, but it does fade back a bit over time when left in the sun.
It starts out as more of a satin finish than a flat finish.
You can also add a little universal flattening agent to it if you want to dull it out immediately.
I've heard you can also add corn starch or baby powder to dull it out more, but never tried those myself.
I use Dupont flattener.
There are a few "Painting" threads on here ( possibly in the Paint and welding forum ) with a lot of good info on the subject.
If doing a camo job, Rust Oleum high heat black stove paint is actually the best thing I've found for the black. It is flatter than normal flat black and dries super fast. It's perfect for stencils too.