Yes currently color matching to paint is not easily done.
Current process requires a sample of the original color, and takes about 2 weeks to get manufactured, and cost minimum $800.00.

Typically we try to inform our customers to pick a powder color first, then match the paint to it, with over 6500 color available, people usually find something they like, and match the paint.

Yes some powders, just like some liquids are not as UV stable as others, clear coats ALWAYS extend the UV life , durability of powder... just like liquid.

the biggest thing to know is that both paint, and powder are polyester based products, and have more in common, than not like most people think.

Any quality, and informed Powder shop should be telling a similar story