It is definitely possible to match old patina, but you have to make sure to match the original process as much as possible. It looks to me that your truck was painted before with a custom color which you will have to match. Compounding the difficulty is that it appears to have some metallic in it. That will make it really hard to get the new paint to look the same as the old faded metallic paint.
On my truck, I repainted one part to match the original paint. Can you tell which part? I hope not
Essentially what I did was match the original paint process as close as possible. As in, using black sealer/primer and then color matched single stage paint. Once the paint was new and shiny like it came, I started weathering it by slowly sanding it down with various sandpaper and steel wool grades. Many have scoffed at me for this, but it's how I wanted it to look! The result was a very close match to the original faded paint.
