Good question, the grill was painted when I painted the inner fenders, the firewall, and the wheel wells, within a day or so apart. I'd have to look back myself to see if I posted the pics. The grill was completely cleared in aircraft clear. So it may be slightly off but only because I used a different clear on purpose. I planned on installing a chrome overlay so I opted for the harder clear coat over the entire surface more for abrasion resistance and corrosion protection. After I removed the overlay from my other grill and saw the damage I planned ahead.
To answer your question as far as paint times and matching the finish, when I bought the first gallon of paint I reduced it all at the same time. So the mixture is identicle. In other words it's all being sprayed from the same source of paint just at different times. Also I buy the paint from the same store and the same person mixes the paint from the same stock etc. He knows what he's doing and he has matched colors for me on a few other specialty projects I've done as favors. So far so good.
To add to that there is a difference in the clears coats I've used and that does give the finish a different look in certain lighting, more so in the shade. The tub interior, firewall, inner fenders and wells are cleared in aircraft clearcoat. That paint was sourced from my work as shelf life expired stock that was being disposed. The difference is the finish hardness and fluid resistance of the airplane stuff is right up there with powdercoating, maybe even harder. The stuff is very hard, if not impossible to work with but does offer more durability. The airplane stuff is not designed to be sanded and polished to a certain finish. It's spray it and forget it type paint there fore the couple spots a sagged were near impossible to sand and polish out. Good thing those spots are under the Jeep.
Although there is a slight tint difference between the floors and the exterior surfaces it's only noticeable in the shade, and then only if I point out the difference. My wife and friends that have seen it up close think I'm overly picky because they would never have noticed if I didn't say, "look at it like this.. from this angle.. can you see what I'm saying?" Also once the rollbar, front and rear seats, floor mats, and other interior stuff are in place it will all disappear.
The outer areas use the same copper base coat but an automotive clear that not as hard but very workable.