According to this site, the answer is, yes.
http://www.panzerworld.net/zimmerit.html
Someone with some reference pictures will probably chime in shortly...
[edit]
Actually, here you go. Check out the Ausf E about half way down. That looks like it could be Zimmerit to me. Maybe not, but there's some kind of texturing both on the lower hull and up top. The caption would have to be incorrect though.
http://www.wwiivehicles.com/html/germany/pzkpfw_iii_photos.html
Enjoy your modeling...