yeah doesnt look like they colour matched very well .. for the rust, all you need to do is debadge, sand it down bare metal, self etch prime, seal, paint, clear ,done and done lol.. if you are having someone repaint the front half might as well ahve them paint the rear, but to save yourself some cost in labour, do the sanding/priming yourself.... or repaint it all yourself if you know how/have the tools...

the colour code is in the trunk on the lid incase you needed to know