Right folks, sprayers in da house etc..

I'd like to get my bumper and bonnet sprayed soon-ishhh, nothing major tbh just me being ANAL as per..

Thing is and i'm NOT TOO clued up on paint jobs, i was told there's 30 something shades of the White of my 3dr... ?? and i'm abit concerned if i have it done will it match?? as i know of a concours 3dr that had a bonnet spray and if you look VERY carefully you can see the miss-match so to speak.

So, painters etc how is it matched etc??

Sorry for sounding GEEK-ISH but i haven't a clue woth spray jobs etc....

PS, or would you just leave as is so it's original??