It is hard to match especially with the fading This paint may be your color
The best approach is to repaint the whole cowling and masking off the decals. To do a factory new, job, you need to remove the decals and the plastic vent pieces (if removable) and strip the cowling, prime, sand, paint several coats, wet sand and clear coat. You will go through probably 4 cans of paint and two cans of primer per motor. It is a big job. Then you need to buy new decals and as mentioned they are expensive.
So decide what quality of painting you want and go from there.
The body shop approach would be better but again the price can be high.