PollyPoppins

So I'm very new to SL so this might be a simple question but having bought a Maitreya body I'm now looking at heads. The demo I so far like is a Genus head but having adjusted the colour of the head to be as close a match as possible to the body there is still a noticeable line of colour difference at the neck line. Is there a fix for this or do I basically have to keep trying other head brands until i find a perfect match?