even then, the texture of anodizing (or whatever this finish actually is) will be different underneath. you'll have to prep the surface if it's even going to stick and that will also modify the texture... and lastly, metallic colors REALLY show as different from one another so you'd have to paint the whole thing for any semblance of color continuity.
Maybe if the painter really sucks. You need to be schooled in how to blend paint. It can be done. But a computer isnt exactly worth wile to do such work.