No, you can make a matte coat back to glossy through spraying with
2K then buffing it (not waxing it, but using a compound to buff it to a shine). We're not talking about the paint, but the clear on top of the paint. There are plenty of videos on the internet that can teach you how to polish a clearcoat after you spray it (and it cures)
You can also just take that part you made to matte and buff it to glossy.
You need to understand the principles of the material you are working with. When you understand what makes something matte vs. what makes the same thing glossy (it's the same material, the same chemicals in the same type of coat that is being applied) you'll also have a better understanding of how things actually work.
Which is why I wrote:
"...and once you learn this basic principle you really won't give a f' if a part you're buying is glossy or matte. You can adjust your self."
I wrote 'your self' and not 'yourself' intentionally.