Textures should appear the same, why there not, Im not sure. But as for Bryce skies...Bryce 4 has a newly configured SkyLab with alot of different parameters, most all Bryce 4 skies wont look or load right in Bryce 3. Also, you might try adjusting the camera scale to 44.44%, alot of skies use that setting to get the correct effect intended.