I don't have the eyes, but it could be that the textures on the black eyes have more veins painted on the textures and the textures on the Actual eyes have less veins. You can edit the texture yourself in photoshop and then load it back in poser. What I would do is open the actual eyes texture in photoshop then add the black eyes texture as a new layer on top of the other, then delete the Iris part and lightly around it so you don't delete the veins on the black eyes texture now you should have the color of the actual eyes and the eyewhites of the black eyes. you can also try to change the ambience or color a little to pink this might help make the eyes have some veins.