"Toe Up" vs "Cuff Down"-Heel Turn Direction ??

As a new knitter and one that has an addition to knitting a complete pair of sock, I have a questions. Someone asked about the direction heel turn in toe up vs cuff down sock. In my cuff down sock, the heel turn is under the heel. In my toe up sock, the heel turn is at the back of the heel. Does that sound right for both heel turns to be in different directions? Hmmmmm. KnittyAJ