I think the back of the neck gap is caused by converting between ages and genders. So it might not be so simple to convert up the teen version.

Yeah, I was just looking on MTS2 :) I had a little time to kill. Did you see and reject this one?

http://modthesims2.com/showthread.php?t=249271

It's hard to tell on this monitor, but the chestnut brown *might* be close in color. However, it's a lot messier and the texture isn't maxis-like.