Sorry I'm late to this. The t-nation Olympic WL forum doesn't get much action.
Just to be sure, I think you mean pull from where the bar is - thigh or hip.
I think what is more important is your completion of extension throughout the power position.
What I mean, is if I have a wider or narrower grip, the bar might be in different places, but I still transfer the same force.
So, as long as there is no early pull, which could make the second pull start from the thigh it shod be the same either way, with most variance attributed to height, limb length and bar setup.
Clear as mud.