Making LF into Sydney is doable, but because of the differences in topology it has to be done with an HD morph.

Here is the difference in the Topology, LF is subdivided, Sydney is not. This is with an HD morph applied to LF to make her look like Sydney that I just made in Poser.

This is what it looks like quickly rendered.

 

The Sydney texture has a lot of stuff burned into it, shadows, highlights, etc. So it does look slightly different.

The brow and the upper eyelid are posed in this to get closer to Sydney.

The lips, etc would need posed as well. 

With a little more tweaking, it would look just like her.

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