It's not just about how many polygons she has - it's more about how they're placed. LF2's polygons are concentrated on her face, for more detailed face morphs without the need for HD morphs, and in the body they follow major body landmarks for better movement and shape morphs. :) 

Morphs naturally can't be converted from different meshes, yet you can use LF's textures on LF2.

On any case, LF is a great figure, and if she suits your needs better, then all the power to you, have fun with her! I know I did for years :D

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.