I don't think so, if you import a model that has say, 15 parts, you can texture each part separately while it's still grouped, if you select the group and change the texture yes, all the textures will be changed, but if you leave the -texture- alone and -only- change the diffusion, it should change -just- the diffusion on all objects in that group...does tha make sense? don't change anything on the group -except- diffusion....

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