Not quite. Carrara, as of ver3 at least, uses "Mapping zones" which correspond with materials. With a MTL file created by Poser, Carrara will create a proper layers list shader with the right materials zones. On a straight import, however, it will all come in with a single zone...you'll need to open the object again in the vertex room and assign groups of vertices to mapping zones manually. An odd and similar thing happens in the reverse; if you set up mapping zones in Carrara then export, you get an .obj file with NO usemtl statements. My experience was I needed to create a layers list shader and put something in every layer in the materials room before Carrara would "confirm" the material zones and export proper usemtl lines.