Being a red car it will need to be blended out to the surrounding panels or it will stand out even worse than before the paint job.
Even the single greatest painter on earth won't be able to match a 15 year old red car, basically the paint needs to be blown (blended) out to the door, bonnet and bumper to make it look even half passable, or don't bother.
You'd be better off buying a second hand red guard that will likely match up better if it's just to make the car look presentable to sell it (reading your other thread).
Theres a reason why even minor fender benders cost thousands of dollars in repairs through insurance, it's because it's not as simple as just painting the panel and putting it on.
For example when my VE ute was rear ended. A new bumper and tailgate wasn't as simple as a new bumper and tailgate, the paint had to be blended all the way to the doors which on a ute is a massive job. Just a simple bumper/tailgate replacment was $8000 to make the car all one colour properly.
Trust me, if you put fresh paint on a single panel on a red car, you'll spot it 20 feet away even if the cars had a full paint correction/detail. Red starts fading/reacting to UV the second it rolls off the production line which is why red cars tend to wear the worst in terms of paint quality.
Source: I've done 20 years of painting as a hobby and the son of an ex panel beater/holden paint tech.
This is generally what a red car will look like if you give the painter your colour code then put a freshly painted panel next to a 15 year old paint job. And you'll never think your paint is as bad as it is, until you see it next to a freshly painted panel. A good painter will be able to try and match the paint as best as possible rather than just working off the colour code, but it will still be super noticable.