They can carry the same things... From what I see (might be wrong) the only difference is that, when you save as .hr2, it will always smart-prop to the head.

Usually, .cr2 is used for hair when it needs movable body parts.

The .obj file carries the mesh information. Poser refers to it to know the shae of an object.

 

Conformers are needed for body parts. Many hair creators like to make hair so that the lower parts will move along with the chest. In my Nienna Hair I needed to make it a .cr2 because that long braid has many body parts for movement. Prop/.hr2 movement can only be done by morphs.

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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.